Computers are vulnerable to virus especially if you are using it everyday browsing the internet. Preventing virus from infecting your computer is the best way to make your computer healthy. There are lots of virus removal tool in the market and some are offering it for free if you are using it for your personal computer or for home use

      Prevention is better than cure. It is a good practice to avoid computer virus from infecting your computer. We can prevent virus from infecting our computers by doing the following virus prevention tips.

Avoid using untrusted Flash disk/drive on your computer

      Common source of a computer virus are flash disks that are inserted on your computer. Flash disk is a portable data storage device that you can use anywhere. You can use it anywhere as long as there is a computer with USB slots. One common source of flash disk infection is from a public computer shops.

      Some computer shops or internet cafe have poor anti virus software which will render all of their computers infected with virus. Once you insert your flash disk into any of the computers inside to save the documents you typed or save the programs you downloaded your flash disk will automatically get infected with a virus.

Avoid Opening websites with Malwares

      Another source of a computer virus is through untrusted websites. There are lots of websites in the internet that embed malware on to their webpages once you access this infected webpage. your computer will no doubt be infected with malware virus. examples of this website are the crack sites, warez, serial kegens, adult sites etc..

      If you happen to open a website and then all of a sudden a popup window will open telling you to scan your computer for virus or you have won one million dollar or something and then instructs you to download and install a software, do not oblige to what it is telling you to do because that is absolutely a trick to infect your computer with a malware virus.

Avoid downloading untrusted Trial Software

      Trial softwae can be the source of computer malware viruses. Not all trial software have embedded malwares but there are other unscrupulous software developers that insert malwares into their trial software programs. So be sure that the software you are testing came from a decent software solutions company.

Enable your Windows computer Firewall Feature

      If your are using Windows XP enable the builtin Windows FIREWALL although this feature will not block all malicious programs coming in to your computer, it will be a good deterrent to the common malicious software entry points to your computer.

Install a reliable Anti Virus Software

      There are hundreds of antivirus software in the market but choose the one that  has the best virus cleaning and blocking methods. Install antivirus programs that will not affect your computer's speed.

If your computer abruptly refuses to play sound, try the following simple steps.

1. First, reboot your computer.
2. Ensure that the computer isn't muted via hardware. Press any external mute buttons, confirm that the speakers are turned on, and turn the volume all the way up. Test by playing a song or using the Sound control panel (click the Sounds tab, select Asterisk, and click Test).
3. If that doesn't work, check Windows. Left-click the volume icon in the system tray and verify that the audio is not muted and is turned up.
4. Right-click the volume icon and click Open Volume Mixer. Ensure that all options are on and turned up.
5. Internal speakers still not working? Plug headphones into the audio jack and test again. If the headphones work, remove them to continue troubleshooting the internal speakers.
6. Right-click the volume icon again and choose Playback devices. Confirm that your audio device (likely 'Speakers') has a green check mark next to it. Click Properties and make sure that 'Use this device (enable)' is selected.

If your sound still doesn't work by this point, you may have a missing or corrupt driver for your audio controller.

1. Uninstall the driver. Open the Device Manager (type device manager at the Start menu search box), go to Sound, video and game controllers, select the audio controller, and press the Delete key.
2. Reboot the system and allow Windows to reinstall the driver, which it should do automatically. If it doesn't, download the driver from your PC maker's site or audio card manufacturer's site, and reinstall it manually.

You may not care enough about bug fixes and minor features to keep every single app on your hard drive current, but you'll need to keep Windows and a few major apps (such as your browser, your PDF reader, and your office suite) updated to avoid nasty security exploits. Fortunately, you can arrange to have all of these updated automatically.

Updating Windows

Open Windows Update in the Control Panel. Click Change settings, and set the drop-down menu to Install updates automatically. If you don't have Microsoft Update installed, only Windows updates will download automatically. If you have other Microsoft apps installed (anything from Silverlight to Office) you'll need Microsoft Update. To pick it up, click the Click here for details link at the bottom of the Windows Update window.

Updating Your Browsers

Every major browser has an automatic updating function of some sort, so your browser should already be covered. Microsoft delivers Internet Explorer updates via Windows Update, and Google Chrome receives its updates behind the scenes; to see whether your version of Chrome is current, click the wrench icon and choose About Google Chrome; if your version is old, the dialog box should give you the option to update.

Like Chrome, Firefox handles its updates internally. Get the latest releases from Mozilla by opening Tools, Options, Advanced, Update, and checking Automatically download and install. Safari's updates are handled via Apple Software Update, which normally is installed with Safari. If it doesn't run automatically, open it and go to Edit, Preferences, Schedule, where you can select your preferred update frequency.

Updating Adobe Acrobat

Definitely keep Adobe Acrobat updated because it's a popular target for malware. You can set it to update automatically by selecting Edit, Preferences, Updater and checking Automatically update and install.

Updating JavaScript

Go to JavaScript (on the left-hand side of the Preferences window) and uncheck Enable JavaScript. Since JavaScript is a common attack vector for malware, your system will be safer if you don't have it enabled by default (you can always re-enable it for individual PDFs that you deem nonthreatening).

Updating your machine's drivers keeps the system current on bug fixes and support for new features. It can also break things that weren't broken, however, so if you notice that your PC is crashing or behaving strangely after applying a new patch, you should revert to an older version and see if that fixes the problem. Fortunately, whether you install new drivers manually (via download from a manufacturer's Website) or through Windows Update, you can revert to an older version fairly easily.

1. Open the Device Manager control panel.
2. Browse to the device whose driver you want to roll back. Double-click the device in question.
3. On the properties screen, click the Driver tab, then click Roll Back Driver and follow the wizard to revert to the previously loaded driver. A restart will be required.

If the option is grayed out, an older driver is not available. If you know that the driver has been updated, you may be able to recover it by using Windows' System Restore function, which will also undo driver installations.

 If you're the only one who uses your computer, and you're not worried about it (or your data) falling into someone else's hands, you may not need the protection that the login screen provides. 

Here's how to turn it off: 

Open the User Accounts control panel.

2. Delete any unused accounts that are not your primary, personal account. (Click Manage another account, choose the other accounts, and select Delete the account.) You can ignore the Guest account, which is likely turned off.

3. At the main User Accounts page, ensure that your primary account is active. Click Change your password.

4. Enter your old password where required and leave your new password blank.

Reboot your machine, and it will load Windows directly without presenting the login screen. Just remember that you are compromising your system's security by operating it without a password.