Windows 7: Does disk scan run after a power off?

I'm applogize for the dumb question but does windows run disk scan on startup if necessary?

I have a problem that causes my laptop to freeze after it is idle for 20 minutes and I have to power off. But during restart disk scan don't run so I've manually scheduling it and restarting again. Do I need to do that?

Yes. If Windows finds a problem with your hard drive, or something is acting odd, that will trigger a disk check. I still recommend you go ahead and run one. Also, when it comes to computers, no question is a dumb question