Flight sim planes uninstall problem

[dharris]

I recently downloaded a demo of a p38 and used their installer. It worked well but after two days the demo was done, so I used their uninstaller and now fsx is broken. After going back and cleaning out the entries that were left over including the dll.xml file, frame rates are horrendous. Went down from average of 25 in Megascenery Dillingham to 4-5 fps. Once airborne most aircraft will no longer climb. Some will, by selecting different aircraft I have found some that will work. I have rolled back video drivers from the 190 series to 182.50 but still getting low fps and elevator control only on some aircraft. Calibrated usb joystick also. Fan control on evga precision is set up to 80 and norton is shut off. Also use Nhancer settings by Nick Needham
After 10-15 minutes sim will lock up. Any suggestions? In the future, I will no longer use installers, just manual so I can see where and what is installed. Thanks