You mean you can't boot into Safe Mode? You should be able to, I don't know what F key you need to press, but start with F8 while booting, if that one doesn't work try them all until you find the right one. If Windows starts to load normally you've not found the right F key, power down/up and try a different one. If you do get into Safe Mode, uninstall the program you just recently installed. I hate to say it, but if you're truly unable to get into Safe Mode you might have to reinstall Windows.