I've tried for a few days to run a full scan, each time it tells me that the Estimated Time to completion is 597 minutes.

7 hours and 40 minutes after I started the scan today, I clicked 'Stop Scan' as it was still only at 4.6%

I am having to select drives and folders separately in order to scan the system.

I have Windows 7, and am running Spybot S&D +AV 2.6 Professional on Administrator

Any help you can give will be appreciated.
Many thanks