Quicktime 7.4 downgrade to 7.2, then upgrade back, has stuffed QT!

Okay, so I stupidly upgraded to quicktime 7.4 when my mac helpfully told me there was a new update available. I know not to do this on my Avid, but thought that apple quicktime and apple FCP Studio would be compatible... hmmm.
Needed to work with flash and mpegs so found a post on here with instructions on how to downgrade back to 7.2/7.3 (using Pacifist). Did this successfully on my G4 and this now happily lives in the past running QT 7.2 and is able to open and play all my flash videos.
Thought the downgrade on my G5 would also run smoothly, but after downgrading to 7.2 QT no longer opened, DVD Studio Pro said it needed 7.3 to run and FCP wouldn't open. So I downloaded and installed the 7.3 upgrade (figuring I can live with one mac that can see and convert flash quicktimes).
Same again - QT wouldn't open, neither would FCP and now also the System Preferences won't open. Eeeekk!
So I thought, I'd better re-install 7.4 and at least get the mac running properly. Still no joy - no QT, no FCP and no system preferences.
I'm getting desperate and have now wasted almost 2 days on this problem. Why are apple releasing buggy updates? And why do they not have any solutions?
Any help would be ever so greatly appreciated.

To The Apple Discussion Boards!
See if the following helps:
Do an archive and install of your OS from the OS disc. Stop at the QT upgrade you need.
http://docs.info.apple.com/article.html?artnum=301270 Scroll down to "Archive and Install”
*Regarding Pacifist:*
See QuickTimeKirk’s posting in the following thread:
http://discussions.apple.com/thread.jspa?threadID=1357579&tstart=0

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Disable your firewall/security software, then try again.

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http://www.mediafire.com/download/juwuzck8wpq6j0r/issues.rar
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The temps do not appear to be reaching astronomic levels, maxing out at around 60-65c (cpu) and 45c for the GPU.
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gpu - MSI Lightning 680 (no OC)
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hdd - Black 1TB
case - HAF 942-x
cooler - x40 kraken
ram - G.SKILL Ripjaws Z Series 32GB (DDR1600)
Here's what I tried
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* Bugcheck Analysis *
BAD_POOL_HEADER (19)
The pool is already corrupt at the time of the current request.
This may or may not be due to the caller.
The internal pool links must be walked to figure out a possible cause of
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fffffa802224f9e0 Nonpaged pool
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PROCESS_NAME: chrome.exe
++++++++++++++++++===============================++++++++++++++++++++++==========4
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VIDEO_TDR_TIMEOUT_DETECTED (117)
The display driver failed to respond in timely fashion.
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Arguments:
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nvlddmkm+153e20
fffff880`0fa2be20 ?? ???

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Quicktime 7.4 downgrade to 7.2, then upgrade back, has stuffed QT!

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