Yup, it was on my pc. I'm using Windows 7, thank goodness!
I eventually un-intstalled it, then re-installed it, and now it works fine. Hope I don't have to do this every couple of months! It's a pain!
Oh, and I tried downloading the v6 of Desktop Manager, but I had trouble trying to get it to download properly...maybe in a month or so I'll try again. Our download speed is very slow, so that may be a problem.
Thank you for both of your help!!