You're either talking about System File Checker (SFC) or CheckDisck (CHKDSK). If the freeze occured during SFC, you may be looking at a corrupt OS. There may be some relevant data within the log file, but we can't be sure untill we can look at it.
If the freeze occured during SFC, please run ChecDisk and then try SFC again. Either way I'd recommend backing up your data if you have not already done so.
The results for the above test can be found in: C:\Windows\Logs\CBS\cbs.log
You will most likley have to copy this file to a different location and then you should be able to access it. Find the date you ran the scan, and copy/paste that information to the thread.