BSOD when starting Windows 7 for the first time (end of installation)

[Pakundo]

Hello there people of the internet, I find myself in quite a bit of a problem.
Ever since April, something happened that caused me to get the "Desktop Windows Manager is disabled" problem, even though it was constantly running.
Aero stopped working, and my mouse would completely disappear to the left of the screen instead of stopping at the left most pixel.
Yesterday I've had enough of that, and seeing as uninstalling Internet Explorer 10 and that particular update that ended with 383 in its name did nothing to help it, I decided I might "upgrade" my existing Windows 7 Ultimate 64-bit installation to the same thing, thus essentially reinstalling.
After a very lengthy installation (understandable, apparently I have over a million files and the majority of my hard drive is full, I have around 75~GB free out of 460~), my PC restarted once more, and this time it was about to finalize Windows 7 by performing the "starting windows for the first time stage".
A few seconds into the loading screen, and I got this:
http://www.mediafire . com/convkey/c37b/xf6awn1sxdky5omfg.jpg
A BSOD with an error that doesn't mention any kind of file at all, just the following error: STOP: 0x0000001E (0xFFFFFFFFC0000005, 0xFFFFF88005DF24CO, 0x0000000000000000, 0x0000000000000000) That error keeps happening every time I try to boot up, and it seems that safe made can't finalize the installation itself, either.
I figured this means there is no way in **** I can save my current failed Windows 7 re-installation, so I thought I should just try and edit my main partition, reduce it by size a bit, then copy all my personal files to a new partition, then slowly decrease/increase partition sizes as I copy the files.
That could've been the end of it, except... I installed UBCD on a USB flash of mine and made it bootable, and then I opened gParted in it to try and edit the partition, except I couldn't, because I got alot of cluster accounting failure error lines on it.
Now, I'm pretty sure the hard drive itself is just fine, it's the failed Windows installation that did that, but my serious issue here is that I can't seem to be able to fix that windows installation, and I'm not sure what else I can do to at least make my main partition 'healthy" enough so I can freely resize it. Formatting my drive at the moment is simply not an option - I have no backups of the important files I have, and many of them date around years.
The ultimate last resort, where I disconnect my hard drive, connect it to another computer and copy my files that way (as it seemed I could browse through my drive via UBCD just fine, making it seem all the more likely it's only just about the problems the faulty installation caused) isn't quite an option at this time, though I will try to do that.
I've already tried chkdsk, all other methods of repair installation via my Windows 7 install disk, I've tried all options with Bootrec.exe (which, btw, found no windows installations.) I'm going to try UBCD4Win, which apparently has alot of system utilities that may solve my problem.
In the meanwhile, does anyone have a suggestion for me? Anything I haven't tried yet? Anything I missed? Intel i5-2500 Quad Core @ standard clockrate of 3.3GHz, 4GB of functioning RAM, an Nvidia GTX 560 that isn't fault (I actually had a real faulty one replaced with this), and a standard 500GB hard-drive that never gave me problems before.

 

[Arc]

A stop 0x1E BSOD may be caused by various reasons.

According to Carrona.org, STOP 0x0000001E: KMODE_EXCEPTION_NOT_HANDLED
Usual causes: Device driver, hardware, System service, compatibility, Remote control programs, memory, BIOS

From your post, that first parameter is 0xC0000005, which means: STATUS_ACCESS_VIOLATION A memory access violation occurred.

Either some driver causing/passing bad information to the memory, or a physical RAM is causing the problem.

Test your RAM modules for possible errors.
How to Test and Diagnose RAM Issues with Memtest86+
Run memtest for at least 8 passes, preferably overnight.

Not able to see your screenshot, but assuming that you cannot start the computer. Do you have access to another computer right now? If so, download Partition wizard Bootable CD (the last one in the link). Burn it in a blank CD or in a USB flash stick.

Boot into Partition Wizards GUI following this instructions. When you are on the last screen, take a camera snap of the screen and upload the snap here.
Screenshots and Files - Upload and Post in Seven Forums

We need to see the partitions and parameters.

If you want to start afresh, that is not impossible. You can copy all your data to an external disc, if you want. Follow http://www.sevenforums.com/tutorials/93347-copy-paste-windows-recovery-console.html.