RPC not available?!?!

My laptop was working fine until I rebooted. After I rebooted, Aero thems is gone. I cannot save any of the settings. Audio is not working. Networking is not working!! I cannot use anything in the control panel. I came to realize that RPC is not available but when i typed services.msc in run, rpc is running well..
Tried finding solution everywhere in web , but could not find.
I'd be very grateful if anyone can help me solve the problem. Thank you in advance.

Your problem does seem massive but couple of things you can try before doing a repair install:

1) Download malwarebytes antimalware free and run a full scan. Let it clean whatever it wants to.

2) Run CMD as admin then type "sfc /scannow" without quotes, hit Enter. You'll need to run this at least 3-4 times.

Good luck!

Thank you everyone for the reply. System restore is not working either. I tried repair install, but the error pops up after I click the INSTALL now button from the Bootable Win 7 dvd as
" Window could not retrieve information about the disk on this computer".
Any suggestions I should do now!!
Thanking in advance.

On top of that, I had encrypted my encrypted partition with the bitlocker. Now If I happen to format Windows 7, would I be able to access that partition?? I got very important documents in that partition.
I would really appreciate help on this.
Thanking you in advance...