I got happy on EBay one night and ordered an IDE to USB adapter. Lately I have been using it for scanning hard drives for viruses. It does a great job, but is very slow. This is ideal for locations without adequate internet access. I simply pull the hard drive in question, hook it up to the adapter and plug it up to my laptop. Kick off AVG to scan the drive and replace it when done. No files are locked during scan so everything should clean up nicely with one pass.

Also, no software had to be loaded on the customer PC and I didn't have to wait on any updates to download. (but it scans slow .. so have something else to do while you wait .. or take a couple back-to-back lunches)