After i ran the program GameXP to increase my computer/game performance i am no longer able to use the switch user feature of windows. Whenever i click 'Switch user' iin the logoff screen nothing happens, the screen just disapears and it goes back to the desktop like nothing happened.

i tried going in to start > run > services.msc > fast user switching and turning it on and to automatic again, but that doesn't seem to fix it at all.

i also went into contro panel > user accounts > change the way users log on/off and click the option for using fast user switch, but when i hit apply, it doesn't save....

if anybody knows how to get this working again i would really appreciate it. thanks.