Windows 7: Windows 7 Home Premium 64 bit is not working . Need help, please.

My os is not working anymore, not working as in it takes forver to open anything, and it cannot be shut down through windows, had to press the power button to shut it down. This doesn't occur when I am using it in safe mode. I am able to post this because I installed ubuntu as an alternative os, long time ago ( just to use the open office, hehe). The only possible cause I can think of is that I accidentally cut the power by unplugging the adapter few days ago. After the incident, the fan is running very loud every time I turn on the laptop. Is there any way to fix this?? I am using dell studio 1557 (shit product). Thanks.

Do you have a backup from before the problem started?

Do you have a win 7 dvd, or the restore dvd that came with win 7?

Run a Repair Install from the Desktop

Best to multi-boot with Linux on a separate drive then use BIOS to select HD to boot. GRUB corrupts Windows 7 on the same drive.

Repair Install will reassert Windows 7's boot manager on the HD, so either move Ubuntu to another HD or try adding it using EasyBCD 2.0 from Windows 7. If you must add GRUB, prepare for it to corrupt Windows 7 again.