OK lets see if we can get the signatures back on the drivers … I have been looking at this and it appears to be unique to xp
[step 1] Navigate to %WINDIR%System32CatRoot2 and locate the file edb.log
[step 2] Click start->run and type services.msc to open the system services dialog, then click OK.
[step 3] Stop the Cryptographic Services service.
[step 4] Rename edb.log to edb.old.
[step 5] Start the Cryptographic Services service.
Reboot and let me know if Avast is now quiet