You might have to uninstall the current version you have on your computer thenrestart your computer.
Run the chkdsk disk utility
Click start run type cmd then type chkdsk/r/f which will scan for and attempt to repair any bad sectors and automatically fix any corrupt files on your Hard Drive.

or an easier way to run the chkdsk utility

Windows 7 chkdsk
http://www.w7forums.com/use-chkdsk-check-disk-t448.html

Click start control panel administrative tools computer management ,disk management right click on your drive select properties click tools click check now click start two boxes

automatically fix files and scan for and attempt recovery of bad sectors place then a tick in both boxes then select check now, start should schedule this task when restart

have no input while the chkdsk utility is in progress any input may further damage your computers Operating System and Hard Drive

http://download.cnet.com/jetclean/3000-18512_4-75627788.html
JetClean tidies your registry, gets rid of junk files, deletes broken shortcuts, and attempts to give your computer that like-new feel again.


Optimizers and Diagnostics.
http://download.cnet.com/360Amigo-System-Speedup-Pro/3000-18512_4-75332741.html5E3422139C19CBED35C14826A44D4605
Improve your PC performance and fix errors.

You might also do a disk clean up click start click on computer to open right click on your hard drive usually C: select properties in the general tab select disk clean up click ok you can view files to be deleted.


Then reinstall.