When I had a similar prob I used the "Search " option and found residual parts of the program still loaded. I deleted these entries and the problemwas resolved. I also used a registry checker which found invalid entries for the deleted program still in the registry. For this I recommend System Mechanic which is available on a 30 day trial from Cnet downloads. It was so useful that I paid for the full version!!
As a final resort try Systems/System restore and choose a restore date a few days prior to your problem.
Yesterday I uninstalled two programs from my computer. One was a music downloading application which I didnt need (Kazaa) and the other old printer software. However now when I go to open control panel I am told explorer has caused an error and it will have to close. now cannot open things such as My Documents. Please, how can I fix this and what has gone wrong? Any advice will be appreciated!