Some notes from the latest McAffe Fuckup on the XPS:
getting high CPU usage from mcscript_inuse.exe
After I killed it, a scan32.exe process went into high usage and I killed it also.
This thread on the McAffe forums mentions a hotfix that I haven't had time to try:
http://community.mcafee.com/showthread.php?t=219100&page=2
Here is more info on the hotfix. Later in the thread it is disowned as a fix for any problems:
http://forums.mcafeehelp.com/showthread.php?t=224094