Windows 7: Is there a program/application(free) to scan and fix disk errors?

I tried using Auslogics Boostspeed trial version,
It's actually pretty cool 'cause it scans and shows how many junks files, registry errors, fragmented and disk errors there is, plus status if it's critical or whatsoever.
But since it's only a trial version, I can't fix/repair all of the errors.
the last time i checked showed that my computer doesn't have disk error but have other issues that need to be fixed. So i was wondering if there's such a program or i can manually check and fix stuff like this. Thanks in advance and have a nice day people^^

Windows has a built in disk checker. You can access it by right clicking on your drive and choosing "properties", then "tools" then "error-checking".

You can also run it from a command prompt.

You can also download disk utilities from your drive manufacturer's web site.

also if you have any issues with system files etc then you could run the system file check
a tutorial howto is here...

SFC /SCANNOW Command - System File Checker - Windows 7 Forums

ok.thanks^^
i'll try both and update you after.
thanks a lot.^^