Quicktime  and firefox issues

when installed, quicktime overwrites flash files, like youtube or any ads that use flash, with the quicktime logo with "?". before, if i uninstalled quicktime, flash would work again.
now even with quicktime uninstalled, firefox promts that the "quicktime plug-in only works with quicktime version 5 or later and to visit apple.com to download quicktime". installing quicktime 7.1.6 leads to the disappearance of all flash once again.
this problem only happens in firefox; flash works fine in both Internet Explorer and Opera.
EDIT: when quicktime IS installed, the only MIME settings selected are for quicktime movie. nothing under the Misc. category is selected.
this has been entirely frustrating and any help that can be offered would be extremely appreciated.
Windows XP

How to view/hear pretty much everything:
Assuming you already run OS 10.4.9 or above and have Quicktime 7.2, and are using Safari 2 or 3, download and install (or re-install even if you already had them) the latest versions, suitable for your flavor of Mac, of:
RealPlayer from http://uk.real.com/player/
Flip4Mac WMV Player from http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx (Windows Media Player for the Mac is no longer supported, even by Microsoft)
Perian from http://perian.org/
Adobe FlashPlayer from http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash
In Quicktime Preferences, under advanced, UNcheck Enable Flash, and under Mime settings/Miscellananeous only check Quicktime HTML (QHTM).
In Macintosh HD/Library/Quicktime/ delete any files relating to DivX (Perian already has them).
The world should now be your oyster!
You should also have the free VLC Player from http://www.videolan.org/ in your armory, as this plays almost anything that DVD Player might not.

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