Here's a little lesson I learned this morning: If you're going to do some hard drive housekeeping, be sure to run Disk Cleanup's "Compress old files" facility before you run Disk Defragmenter. I spent a few hours last night doing it the other way around - I even left my PC on when I went to bed shortly after midnight so Disk Cleanup could finish doing its thing - and discovered this morning that my previously nicely-organised hard drive had become a sea of red fragmented sectors in Defrag's analysis report.

I mgiht even do two defrag runs just to make sure everything's in good order.

And maybe delete some hefty files.