Hi
if CMOS reset followed by bios reset defaults
reset date & time
does not help
Try booting off a Windows 7 DVD or USB or Emergency repair disk
You should have a Windows DVD or usb or emergency disk and backup procedures ready in case of PC/Windows problems (especially if you only have one Windows PC in houshold)
http
/www.techsupportalert.com/content/how-prepare-boot-or-system-problems-creating-windows-7-repair-disk.htm
let repairs run and see if this helps
if chkdsk did not run then try again and make sure chkdsk is run
if lots of hard disk errors reported you may have a dying hard disk
personally I like to check hard disk for damage before using chkdsk or emergency disk
Hirens CD (15.2) has several hard disk...