Do you have System Restore
from before the issues arose which you can try? They are reversible.
This may be a known issue which can be resolved by googling it agilely.
I guess if the new profile has none of the problems then you could move over to it. If it did it calls for a Repair Install or Factory Recovery/Reinstall but probably not if a new profile behaves.
But I would want no performance issues remaining at all, and the Windows 7 standard of instantaneous response with no-hangs ever on adequate hardware.
Otherwise Repair Install
or Clean Reinstall - Factory OEM Windows 7
- steps are same for retail.