i presume u cant uninstall it in the normal mode or in the safe mode since u cant go there itself !
so : first check if it is a start-up. if it starts up every time u boot. remove it from your start-up list. also if u can identify any of its processes in the task manager, kill them. it shouldnt remain in the memory.
then: try running updated ms antispyware, adaware, spybot, since they detects and remove most keyloggers successfully.