king,

Firstly, did the system work ok before installing Avast?

Can you start your system in Safe Mode?

Apparently, some of the files you deleted were necessary to system operation. Sometimes, even Avast, can identify files that are harmless (false positives).

If you can start in Safe Mode, we may need to Restore your system to an earlier point before Avast was installed.

Instructions on how to do this can easily be found in the HelpSupport section of XP.

techie