Well, from what you wrote before, 776390 is the number of items it Spybot looking for, so I'm thinking that maybe the scan completed but ended poorly?
Oh, if the suspect computer is a Windows 98 computer, and if the HD has not been maintained, then there is a very good chance that the hard drive is horribly fragmented. It's been my experience that extreme fragmentation on Windows 98 FAT32 hard drives (especially older hard drives) can and will cause program crashes and general instability. And slow your computer to the point of where it's as slow as a herd of turtles stampeding through molasses!
If I were you, I'd check the Windows 98 hard drives for errors, with either CheckDisk or Norton Disk Doctor, and then defragment that bad boy. I had an old Windows 98 desktop that was so fragmented that every time it accessed the hard drive, it made a sound like a bicycle chain! Spybot took forever to run on that thing. I resurrected it by running Norton Disk Doctor from the CD (which found and fixed lots of hidden problems like various file errors and cross-linked files), then defragmented the HD (which took over 10 hours!).
You also might try installing
Speedfan and use it to check the S.M.A.R.T. status on the hard drive, in case the HD is so old and tired it's causing data problems. But I'm betting that bad fragmentation is part of your problems.
-Bill.