That's odd.. Do you happen to have CCleaner? If so try cleaning your registry, I have to do this every time I uninstall anyways, else my SA-4 will miss 99% of Lead shots, and my SA-5 misses targets it shouldn't. If you don't have it you can get it from here: http://www.filehippo.com/download_ccleaner

Before you use it (assuming you haven't) make sure you go into the "Applications" tab and uncheck some of the delete options for your preferred browser. If not you'll end up deleting your cookies, site preferences, etc. Also, when you clean your registry, you need to do it until CCleaner reports 0 errors twice.