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What to do if my computer is infected by a virus or a malware?

I am running Windows 7. My laptop is infected with virus which is not allowing me to run some executables. I am not able to install the anti-virus too. Because of virus internet is also not working on my system. Please suggest some solution.

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You could run Windows Defender first. –  Vervious Aug 18 '10 at 18:11
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marked as duplicate by Diago Aug 18 '10 at 19:22

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Try the usual pack of virus-killing programs: SuperAntiSpyware, MalwareBytes, Microsoft's Malicious Sofware Removal Tool. All of these can and should be downloaded onto and run off of a flash drive. If that doesn't work, you may have to reinstall Windows.

But after you eradicate the virus, there are a lot of other things you'll need to do to keep that from happening again. For one, make sure that you don't run an Administrator account (even with UAC, entering a password is a much better sanity check than clicking the Yes button). Install WOT into your browser (preferably Chrome, as it's the only browser with sandboxing as of now). Maybe even the new Noscripts extension for Chrome if you don't mind the timesuck it takes. Install an anti-virus program (Microsoft Security Essentials is fine) before you get a virus. Back up your stuff. Don't disable Automatic Updates. All that fun.

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SuperAntiSpyware worked and now I am able to install my actual anti-virus McAfee. Thanks. But the internet is still not working. I tried installed driver recovery but of no use. It shows the available networks but with Limited Access. On diagnostics it gives "The wireless network adapter is experiencing problems" and on further diagnostics it says "There might be a problem with the driver for the Wireless Connection Adapter". What to do? –  Akhil Aug 18 '10 at 19:47
    
Reinstall Windows. –  digitxp Aug 18 '10 at 20:29
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Plug in the windows install cd, boot from it, reinstall.

Get ready to repeat again, since your goal is to fix the virus, not to plug in the holes it used to get into your system.

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