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Windows XP? http://www.kerio.com/kpf_download.html

What did the blue screen say? and now it is a blank screen after you reinstalled?

Deleted from the desktop and the start menu?? Try taskbar properties choose display as icon and in menu or if its already chosen choose something else apply the changes then go back and change it again.... this has worked for me in the past... should pop that sucker in there do you have tweakUI? there's some options in there too