There are cases where anti-virus program remove
critical system files in the system32 folder.
This will result in BSOD when windows boot up.
It happen to Symantec in China, May 2007 when they made a mistake during live update and the anti-virus mistake 2 windows system files as virus and delete the files.
Suggest that Clamwin protect these files by making a backup copy somewhere safe. When these system files are infected by virus. Clamwin should replace these files with the backup so that BSOD will not occurs.