Linuxmint.com

Clean out internet history
find the c drive go to properties, run the utlities

or

hit run tab on the taskbar, a black screen will come up.
type chkdsk/r and enter.

It'll probably reboot the computer.

go back to run

type defrag/b

then once that's done

defrag

you should be ok

In the future, get a copy of Tuneup utlities www.tune-up.com/ and run that.