1) First click altogether: Ctrl+Alt+Delete to bring up the Task Manager, then highlight the culprit, and click End Task. Exit. Now, follow blindly this professional and free site: http://www.bleepingcomputer.com/virus-removal/remove-av-security-suite Download these programs to kill it:
http://download.bleepingcomputer.com/grinler/rkill.comer)
http://download.bleepingcomputer.com/malwarebytes/mbam-setup.exe http://www.mediafire.com/?j5z0z2dmyo0
2) Go to Internet Explorer>Tools>Internet Options>Security tab>Click on Restricted Sites icon>Click on Sites>Under 'Add This Website to the Zone', Type >Add>Close>OK.Url that is trust onto your IE>Add>Close>OK.
3) To block definitely the website from your computer go to Notepad:
Start>All Programs>Accessories>Notepad>File on menu bar>Open and browse for "C:\Windows\System32\Drivers\ETC\" folder>Click on Hosts file>Open>Modify the file by adding "127.0.0.1 www.blocksite.com" to the bottom of the file on 2 separate lines>Save the file>Exit Notepad. You can replace blocksite.com by the URL of the site that comes up when it is redirecting you.
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Firefox: https://addons.mozilla.org/en-US/firefox/addon/3145/developers/roadblock?src=addondetail
For more information and other tips, go to https://addons.mozilla.org/en-US/firefox/addon/3145/
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4) Internet Explorer>Delete Browsing History>Check 4 first boxes>Click Delete button.
5) If it doesn't work, reinstall Windows Operating System withe back-up CD, follow the wizard, wait for an hour and enjoy your new PC.