Ok my friend

go to safe mode
disable every security system (antivirus or antispyware).
run defragmentation on ur C drive

by RIGHT clicking on my computer and then select manage
select disk defragmenter and continue

at the end

go to start
go to run
type cmd
hit ok
type this command
Chkdsk /f /r
hit enter

reboot the computer

hope that will fix it

cheers