I had a disk optimizer called Diskeeper 9 and a malware removal program called Spyhunter.
During the latest program update, I was upgraded to ver. 3, which knocked off my background wallpaper and my defrag.
I tried to relaunch, but only had the ability to scan, not defrag: I had been downgraded to trialware.
Emailing the company of my plight, they told me to use add/remove to completely eliminate any traces of the corrupted files from my computer before re-installing.
I still can’t get it to work.