Restart your computer During the boot process you will see on the screen to press a certain key to enter setup usually the Delete or F2 key this will vary depending on your computer and operating system Press and hold that key during the boot up process to enter BIOS using the arrow keys load failsafe defaults or load optimized defaults press escape then press f10 to save to cmos to restart.
or you might repair your computer
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. also download the registry cleaned cc cleaner http://download.cnet.com/ccleaner/
You can also run a free registry scan using utilities from http://re7.info http://www.download3000.com/showarticles-182-0-date.html
System Utilities. http://www.download3000.com/showarticles-178-0-date.html
Optimisers and Diagnostics. http://advanced-systemcare.soft32.com/
One-Click Free System tool for PC tune-up and maintenance. Registry repair. Hope this helps.