Windows 7: Random crash that deleted User Account and all files.

HP G62 Notebook

Sorry for the title, there was no error code. I'll explain as best i can as i've never seen any computer do this before.

On the laptop playing football manager 2012, computer crashes. I reboot and it goes to some system recovery program (most possibly HP's own). So i reboot from scheduled restore point(2 weeks before hand) and windows 7 loads up.

My user account is gone, all the files have disappeared. I go on to my girlfriends user account and nothing is gone, the pictures she uploaded from the previous day are still on there.

Just can't explain why it happened, i don't even know why the laptop crashed. On my gf's user account i tried to access the files but they are obviously not in the same location. I havent tried a recovery program as of yet as im not sure which one to use. I would rather know what the problem is and if it can be fixed without those means but if not it doesn't matter.

Would really appreciate the help.

run
SFC /SCANNOW Command - System File Checker
and
Disk Check

user account files were in use at the time of the crash and are quite possibly damaged resulting in the account not being displayed.
This is the best two steps to start with I think.