very long start up

I have a windows xp sp3, compaq presario, 2 days ago i was hooking up my lamp into a power surge protector, and i heard it sizzle, so i turned off the power surge protector, that made the computer,etc turn off, and when i got to turning on the computer i would have the black screen for 3-10 minutes, then the blue welcome screen froze there. then i decided to ctrl alt delete and it brought up the desktop, now everytime I restart thats how i bring up the desktop, also computer freezes for 2-6 minutes. how can i stop this? I am on dial up but ever since this happened its realllllllly slow. Thanks in advance,

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