Reinstall of W7 onto a _invalid_ W7

Hi,

I have a STOP: 0x0000007B BSOD, Windows cant boot up.
And it seems I cant solve it (tried W7's startup repair tool - unable to repair, tried System Restore - unable too, run into an error... ??? -, tried Fsecure boot scan CD not found any virus in the bootsector, tried fixmbr/boot commands, but nothing, still BSOD while boot up).
So it seems I have to reinstall W7.
My question is:
Is it possible to reinstall it onto the old one without any loss on the hdd? I mean the ProgramFiles, MyDocuments etc folder(s)?
I remember I have installed once time Vista again over an already Vista installation, and when it was done, everything was right, every program were there etc., such like nothing happened. But I don't know what was selected during the install; upgrade or new...

Thanks for helping

Check your ram.
Memory Diagnostics Tool
Memtest86+ - Advanced Memory Diagnostic Tool

Copy out your files first: Copy & Paste - in Windows Recovery Console - Windows 7 Forums.

Programs must be reinstalled if you can't repair Win7.

See if you can boot into Safe Mode to run a full scan of Malwarebytes

Then run the memtest86 CD scan for 5-6 passes or overnight to stress test. Or run the Windows Memory test from System Recovery Options.

Next try Startup Repair again from DVD Repair console, several times if it finds anything to repair. If not, Startup Repair should automate System Restore, but try again run it separately anyway from the Options list.

If this fails, follow these steps to get a perfect clean reinstall: Reinstalling Windows 7

Thanks guys, good to see that you are try to help me to avoid a reinstall process.
I have ran the Win's memory test (from system recovery console), seems no problems.
Unfortunately it can't boot in Safe mode to try that malwarebytes.

But. Maybe it is perhaps an important info about this crash:
During the morning WinUpdate said that new updates available. Okay, I have checked mostly of them (not all; there were some Microsoft Redistributable xy something or whatever, that I didn't check), and also an earlier update of the Microsoft mouse driver.
Update was went fine, after restart everything was okay.
Then, Security Essentials warned about a critical "something", and I choose to solve it, then it was said to restart the system to finish the cleaning.
I have choosen restart.
And pufff.
Bootup started and after a while, BSOD.

And I stucked.

Because I suspected maybe it was a bootsector virus, that's why I started an Fsecure bootcd scan. "Unfortunately" it didn't find viruses in the bootsector.

Can you remember anything about the critical issue MSE flagged?

Try another bootable AV CD scan, one with rescue capability if you still need to copy out your files: FREE Bootable AntiVirus Rescue CDs Download List

Are you able to see your files from DVD or rescue CD?

If you must reinstall I would wipe the HD first to clear the bootsector and any underlying infection: Clean and Clean All with Diskpart Command
DISKPART At PC Startup

Aaah, unfortunately not. I wish, but I can't recall it from my brain, I just see that name for a moment, you know... :S
Okay, I will try AVG rescue CD (thanks your suggestions, this kind of thing I just searched for; to copy my stuffs).

Yes, I see my files.

I gave you another method in my first post to copy out your files using the DVD: Copy & Paste - in Windows Recovery Console - Windows 7 Forums

gregrocker said:

I gave you another method in my first post to copy out your files using the DVD: Copy & Paste - in Windows Recovery Console - Windows 7 Forums

Yeah, thanks, I saw that, I checked that but it wasn't clear how to... But after you post it again, I was enlightened... Just use that "Open" window as a FileBrowser and use Copy-Paste commands...

Meanwhile, I was over a reinstall... but also coz the system fast as lightspeed... :)
(yet)

Thanks for all you guys for helping!