Windows Vista Black Screen?? Need Help!!!!



I was on and all the sudden a whole bunch of pop ups began to happen...i tried to close them but everytime i closed one two would pop up. If i didnt do nothing, they would just keep popping up with pages. I just held the power button to turn it off and now that i turn it back on it says to click any of the following:

Safe Mode
Safe Mode with Networking
Safe Mode with ?????

Regular start up

I tried all of them and all it does next is a black screen with the cursor on the screen and the loading button above it flashing...what do i do? Please help!!!

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