Click start button->Computer->right click c: drive and select properties-tools->check now
make sure both boxes are checked off and say yes for a scan after next restart, apply, ok
You may need to do this twice.
After it checks your hard drive if it still does not load into windows start in safemode open a command prompt
as administrator then type sfc /scannow
After its done try restarting in normal mode if it still does not start in normal mode then restart in safe mode
you will need to download combofix
from another computer on to a flash drive or cd run it in safemode.