Are you running different versions of Windows on the two PCs? If so, which is running what?

Depends what you mean by "different versions". They are both Windows XP, but the home computer is running a three or four year old installation, while the work computer is just a month or two old.

Both have the latest security updates and service packs, but there may have been some changes in XP between the time my home computer was built vs the work computer.

tanstaafl.