Thanks for your response, spybotsandra,
I'm running Spybot 1.4 in Windows XP. I also have Norton Systemworks installed. This is the 3rd or 4th download of 1.4 since it started locking up on the scan.
A few days ago, some spyware got into my system, but I cleaned that out using software that this site recommended. I now have Spyblaster installed, CC Cleaner, AVG, and Ad-Aware scanware.
I clean my temp files (and other junk) regularly using Norton cleaner or I use the tool ap. I run 500+ mb of RD ram, but co-incidently I notice when S&D locks up my computer shows 100% usuage of computer resources.
I don't know what else to tell you. I hope the information I have supplied is sufficient for you to advice something.