Boot your laptop using Windows 7 installation DVD
on getting "Press any key to boot from CD or DVD" press any key
On "Install Windows" screen, select Repair your computer shown at lower left
In System Recovery Options screen, normally C: drive is default if any other you can make note of the name and click Next
Now in Chose a Recovery Tool window, open Command Prompt. Now You will be at X:\Sources directory
Type chkdsk c: /r and press Enter.
Let it run to completion undisturbed.
If Hard drive error you will get an error if not try to run repair windows atleast 3 times till it will not enter to startup.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0