I installed something on my acer and whenever i start it up now i get blue screen of death. How do i reset it back to a certain date?

I installed something on my acer and whenever i start it up now i get blue screen of death. How do i reset it back to a certain date?
propper need a good sig:\
NVM i think i may of sorted it out
Thanks for your help!
Last edited by Corporal; 29-12-2008 at 07:40 PM.
propper need a good sig:\
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