Windows doesn't startup and blue error.

I have Inspiron 5010 laptop, after it has fell on floor once, my windows stopped working.. So I deleted the windows and installed a freshly new windows 7 .. It then runs smoothly and I install all drivers from dell .. Restarting PC just works fine, however when my computer freeze, I hold the power button till it becomes off and try to get into windows again, when I get windows logo for 3 seconds, I then get this error:

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"A problem has been detected and windows has been shut down to prevent damage to your computer. If this is the first time you’ve seen this stop error screen, restart your computer. If this screen appears again follow these steps: Disable or uninstall any anti-virus, disk defragmentation or backup utilities. Check your hard drive configuration, and check for any updated drivers. Run CHKDSK /F to check for hard drive corruption, and then restart your computer. 
Technical information: 
*** STOP: a bunch of numbers and letters..."

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This has been really annoying for me.. I tried re-installing windows, works just fine, till the point where sometimes it freezes and doesn't respond and I would have to turn it off with holding power button .. And it never starts again.. 

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Yes I have tried the F8 with all option including safe mode and non of them worked .. Just that blue screen error..

Also I tried chkdsk but it freezes during its operation ..

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How can I fix this error? Is it now my hardware is completely damaged?

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Note: I have Ubuntu also running on my laptop, it runs very well without any error whatsoever! Which I have been using to recover my files from windows..

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Please help me..