Thanks all for the tips, though. Igor, I couldn’t access the file you mentioned. Perhaps I was not going about it the right way. In the end I decided to uninstall Autoroute as it can be installed to run from CD and will take up less space. The scan became very slow still through the files I mentioned previously.

A typical file name and path is -214062498.DAT
C:\Documents and Settings\user name\Local Settings\Temp_avast4_\unp15281511\0x00

What are those files and are they essential as without them being on disk scans would be much quicker.