I also had big problems uninstalling the program. What ever I did, cleaned registry and deleted what I could possibly think of, each time I installed it, it would have the same settings as before. In danger of pulling out all of my hair, I just formatted the disk and did a clean install of windows. I hope for future builds, the uninstall will completely remove old settings - at least give an option to keep or remove the settings.
PMS 1.50.1 SB58 - Java 7 update 2 - Windows 7 x86 Ultimate
Intel Core 2 Duo E6560 2.33GHz - 3GB RAM
PS3 Slim 120GB - Firmware v4.00