Help! Dell INspiron 600m just crashed. I manually stopped it by holding

down the power button because it seemed locked up (too many programs
running, and memory going down--stupid, stupid, I know!).
Now when I start it up, I get the black screen with several options
beginning, "We apologize for the inconvenience, but Windows did not
start successfully. A recent hardware or software change..." It then
gives me several options like "safe mode," "safe mode with networking,"

on down to "start windows normally." However, each option leads through

a loop; I click it and it starts back up again to land on the same
page.
What can I do????
I had just updated ADobe Acrobat and downloaded some music files.
Thanks.
j