I had the same experience where VirusScan broke _immediately_ after installing the latest LimeWire.
After trying everything, I found this site
http://www.bugtoaster.com/dw15/Repor...sp?DefectID=77
which suggests executing Avsynmgr.exe from the Run section of the registry instead of the RunServices section.
move the McAfeeVirusScanService key from
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\RunServices]
to
[...\Run]