Constant registry corruption !!

Hi All.
This is my first post on here so i hope this is the correct place for my question.
I am trying to sort out a friends laptop, the problem is that the registry keeps corrupting.
I install windows ( win 7 ultimate x64 ) turn off the computer,, turn it back on and it wont boot ,then the startup repair box starts and takes about 20 mins looking at the computer then stops with the message that startup repair cannot repair automatically,, looking down the list of diagnosis repair details all have completed successfully with a error code 0x0, except for system files integrity check and repair ,,that fails with error code 0x490 so i try the win 7 repair disk and it tells me it cannot find any problems with the computer,, i have run the memory check from the repair disk and that all seems ok but the computer still will not boot to windows,, i have run out of ideas,,if anyone can think of anything that might help i would be very grateful.
thank you.

lehnerus2000 said:

How old is the laptop and specifically the HDD?
The HDD might be failing.

When I was testing the W7 betas in 2009, I installed the first one (I tried) on an old HDD.
It would work perfectly, until I turned it off.
Next time I turned it on, I would have to reinstall W7!

I believe it was some sort of HDD fault.
After I started using a different HDD, it never happened again.

Hi.
Thanks for the reply,,looks like you are correct doing a disk scan now and found a few bad sectors ,,
Will try to repair it but if it dont work will buy a new one as this is about 3 years old.
Thanks again.

Layback Bear said:

Where did you get your copy of Windows 7 Ultimate?

I'm not a expert but I did find a couple.

Read through this tutorial by Bare Foot Kid and see if it helps.

SFC /SCANNOW : Run in Command Prompt at Boot

This one by Gregrocker.

Troubleshooting Windows 7 Failure to Boot

Hi thanks for the reply.
My copy was given to me by a friend in the IT trade.
But it looks like the fault is with bad sectors on the HDD. trying to fix them now ..
Thanks again.

Layback Bear said:

Let us know how well things come out.
I never assume their is one problem.
This can be a problem. It all depends what you got as a gift.

My copy was given to me by a friend in the IT trade.

Hi.
The copy of win 7 ultimate is rock solid as i have been using it on my main computer for almost a year.
The fault is with my friends laptop, he tripped and dropped it while it was on, this has caused damage to quite a few sectors. but they have now been repaired and now chkdsk is verifying free space ,and that will take some time .
But will let you know the out come when it is finished .
Regards