How To Remove

Disable System Restore (Windows Me/XP)
Update the virus definitions
Run a full system scan and delete all the files detected as Backdoor.IRC.Bot
Delete the value that was added to the registry  "nvsc32.exe"  "exe.exe"

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run

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Active Scan on line  http://www3.ca.com/virusinfo

Other online virus scanners are available from

BitDefender, McAfee, Panda Software, Symantec, and Trend Micro.