Avast Reboot constantly

[Brucest]

Avast seems to be asking for a reboot all the time, certainly every time after updating virus definitions.  This is new.  Previously it only happened when significant updates of the program was required.  Any suggestions?  I'm using windows 2000, Zone Alarm, and Windows Defender (which won't start up).

[Lisandro]

Operating system restart needed by avast message could be solved, in some systems, by deleting the file <avast>\setup\reboot.txt

If deleting reboot.txt doesn't stop the requests for reboot check this:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager, if it contains "PendingFileRenameOperations".

Check its contents and if there's only "reboot.txt" from avast4\setup folder, delete PendingFileRenameOperations, don't delete any other key.