Maybe you still have the AV-Monitor of Norton running ?!?

you have to disable/pause it for avast’s Cleaner to work properly !!

And all this is useless, if you don’t APPLY the Patches against RPC-Worms
(imho there are up to 4 of those patches)
or temporarily enable WIN-XP’s Firewall (this block 135 and 445 TCP/UDP inBound, if not, you must configure it to do so)

have you done Windowsupdates repeatedly ? until NOTHING shows up under:

ServicePacks and Critical/Important updates or so ?

???

Also read here:
http://www.avast.com/i_idt_1372.html
and on the respective pages on Microsoft’s site

:wink: