My windows vista keeps going to system repair and not finding problems, but keeps restarting!!!?

i tried going on safe mode but keeps doing it, and every other thing i tried, like recovery, rebooting, and of course, system repair, keeps restarting and going to system repair!!!, recovery said it was successful, and when trying to find a problem, windows said their was no problems!!!!! BUT IT KEEPS RESTARTING TO SYSTEM REPAIR!!!!!!!!!!!!!!, this is what happened, it was going slow so i thought, i maybe need to restart, so i shut it down like i normally do, i press ctrl + alt + delete (because when i go to the start menu and click shut down, it says i need to restart windows normally, which mostly means, it didn't shut down right) i click shut down button on bottom right, it takes a little longer to shut down, i wait 10 - 15 minutes for it to cool down, it says something like, recoverying files and shows a bar in white, then goes to system repair, which it sometimes does this, but always use to go back to windows login, but now, it keeps restarting and going to system repair, my brother siad he just kept on doing it then i worked, but i did it for 20 - 40 minutes and it still restarts. i have another os, linux, on here, which i'm currently using, and it works just fine, i didn't download anything new except team fortress 2 on steam, which it didn't do anything, and i don't download any illegal songs or anything, I NEED HELP!!!!!!!!