My computer is constantly being hit by the W32/sdbot.worm.gen.n virus.  Every time I look up I'm getting a message from McAfee saying that this virus has been detected, and deleted.  Sometimes the virus is getting past the virus scan.  The last time that I scanned (I'm scanning up to 10 times daily) The virus scan software is detecting the above virus which appears as:

Memory Virus Name:  W32/sbot.worm.

The lastest virus detected by the scan was along with the above:  W32/korgo.worm.v.

I don't know what to do.  It is effecting the operation of the computer if I've been connected to the internet for a while.  It will not allow me to use my virus scan-----it begins to run, then shuts down.

Please help.............I'm feeling helpless...........and very frustrated.