Fake Anti-Virus program

I have been hit twice in the past month by a fake anti-virus program which disables your icons, Internet Explorer etc.

It loads itself without Norton Internet Explorer 2010 noticing.

I am lucky that I have years of experience and can fix these problems, how can a virus install itself without Internet Explorer noticing?

 

Resolved Threats:
Trojan Horse
 Type: Compressed
 Risk: High (High Stealth, High Removal, High Performance, High Privacy)  
 Categories: Virus
 Status: Fully Resolved
 -----------
 1 File
[adgredy.class] inside of [c:\documents and settings\administrator\application data\sun\java\deployment\cache\6.0\38\28521166-175da5e7] - Deleted

Trojan Horse
 Type: Compressed
 Risk: High (High Stealth, High Removal, High Performance, High Privacy)  
 Categories: Virus
 Status: Fully Resolved
 -----------
 1 File
[vmain.class] inside of [c:\documents and settings\administrator\application data\sun\java\deployment\cache\6.0\43\556445eb-249122db] - Deleted

Trojan Horse
 Type: Compressed
 Risk: High (High Stealth, High Removal, High Performance, High Privacy)  
 Categories: Virus
 Status: Fully Resolved
 -----------
 1 File
[vmain.class] inside of [c:\documents and settings\administrator\application data\sun\java\deployment\cache\6.0\49\1eff1eb1-1d71e513] - Deleted

Trojan Horse
 Type: Compressed
 Risk: High (High Stealth, High Removal, High Performance, High Privacy)  
 Categories: Virus
 Status: Fully Resolved
 -----------
 1 File
[vmain.class] inside of [c:\documents and settings\administrator\application data\sun\java\deployment\cache\6.0\52\31bba1f4-38d356bd] - Deleted

Trojan Horse
 Type: Compressed
 Risk: High (High Stealth, High Removal, High Performance, High Privacy)  
 Categories: Virus
 Status: Fully Resolved
 -----------
 1 File
[vmain.class] inside of [c:\documents and settings\administrator\application data\sun\java\deployment\cache\6.0\58\fa8f07a-31a0c17c] - Deleted

 

Regards

 

TheBluesBrother