jack,

am I right if you assume you’re not connected (permanently) to the Internet (that you e.g. only use a dial-up connection)?

It seems that the ScanDisk-keeps-restarting is somehow related to avast auto-updater… ???

It may sound silly, but just as an experiment, could you please try to run the disk check while you’re connected to the Internet?? (for at least, let’s say, 10 minutes). So, just connect to the net, do something for e.g. 10 minutes (like visit your favourite web page [this forum?? ;D] and then try to run ScanDisk).

Let’s see what happens ;D ;D

Thanks
Vlk