Tony:
Probably not something you want to hear..... But in the past when I've had some similar problems with one particular computer at the office I backed up all data files, photos, midis etc. and bit the bullet, then took the original restore disks that came with the PC and brought the drive back to original state it was when I purchased it. Usually you just pop the CD in make the selection to format and reinstall the OS and original software. Lots of work and time consuming, but as a last resort it is an option............and since we're getting all rain all weekend long here in Rhody could be a good weekend to do so.
BTW, I download and listen to some techie Podcasts related to PCs. There's one school of thought that it's a good idea to reinstall via the factory restore disk every year or so. Of course that advice is coming from some real geeks.
Good luck
[This message has been edited by Stephenm52 (edited 06-24-2006).]