this might not work but i figured I'd suggest it.
if you can get into safe mode then once there, hit the start button, go to "run" (might be somewhere diffferant on ME, I'm currently using 98se) then type "msconfig" (without quotes ofcourse) that should load up a box thats titled "system configuration utility" go to the tab labled "startup" and uncheck the box labled "load power profile", hit apply and then ok. It will ask you if you want to restart your computer yada yada yada, hit OK and it should restart. OR hit no and then restart manualy (manualy is what I do, simply because I've had problems with those restart boxes in the past) you should then HOPEFULLY get into windows normaly! Please note that this is just a work-around and won't actualy fix the heart of the problem, and so I suggest that you get whatever data you need off and then put on a new operating system (preferably not ME cause its probly the worst operating system on the face of the earth, lol trust me I have first hand experiance.) XP works fantastic so long as you have a decent amount of RAM and a fair graphics card.
Hope this Helps! Signed,
Red