I have observed that users are equally responsible for the disaster which they face during there routine work. While surfing on the Internet they go to various unknown sites, Accept various pop-ups and invitation from unknown source. All such things drive them to the ultimate hassle. Now what you have to do is just go through these points and solve your created problems by your self.
1. Use Firefox as your browser rather than Internet Explorer.
2. Keep your computer updated with the latest anti-virus and anti-spyware software, and be sure to use a good firewall.
3. Never open an email attachment unless you are POSITIVE about the source.
4. Do NOT click on any pop-up that advertises anti-virus or anti-spyware software, especially a program promising to provide every feature known to mankind. (Also remember: the fakes often mimic well-known brands such as Grisoft AVG, Norton and McAfee.)
5. If a virus alert appears on your screen, do NOT touch it. Don't use your mouse to eliminate or scan for viruses, and DON'T use your mouse to close the window. Instead, hit control + alt + delete to view a list of programs currently running. Delete the "rogue" from the list of running programs, and call your computer maker's phone or online tech support service to learn if you can safely use your computer.
6. Do not download freeware or shareware unless you know it's from a reputable source.
7. Avoid questionable websites. Some sites may automatically download malicious software onto your computer.
8. Reset your current security settings to a higher level.
9. Although fake software may closely resemble the real thing, it's rarely an exact match. Look for suspicious discrepancies.
10. Check out this list of rogue/fake anti-virus and anti-spyware products.
List of rogue / fake antivirus / anti spyware products
AntiSpyware 2008 XP
AntiVirus Gold 
Antivirus XP 2008 
Malware Bell 3.2
PC Antispy 
PC Clean Pro 
PC SpeedScan Pro
PAL Spyware Remover
Security toolbar 7.1
Spyware Quake 
System Live Protect 
Vista Antivirus 2008
WinAntiVirus Pro 2006