Additional software is required for QuickTime

Since installing Lion I get this window ( see attached file) when i click a tab on my web browser.If I click Cancel, it goes away, but comes back after a while, if I select Continue, I get sent to a web site that has numerous software video players listed. I've downloaded a few, updated everything I can think of to no avail.  The Don't Remind Me Again Today box is grayed out.
 I've ran malware and virus programs just in case.
Quicktime.jpg
klingon4uAsked:
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klingon4uConnect With a Mentor Author Commented:
1.      In Firefox, press the Alt key to force the top menu to appear.
2.      Click Tools -> Addons.
3.      Click Plugins
4.      Find “QuickTime Plug-in”
5.      Click the Disable button
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strungCommented:
Does this happen on all tabs, or just a particular one? Also, what web browser are you using?

If it is a particular link that causes this, what link?
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klingon4uAuthor Commented:
Ahhh, great question, but seems to happen mostly when ( it just happened while I was typing this and I must click cancel or that spinning disk will just stare me in the face) I try to reply to an email using web mail or change tabs. Its all happening while in Firefox. Perhaps I can try Safari, but that really wouldn't solve the issue.......
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strungCommented:
Well, if you try Safari and it doesn't happen in Safari, we know it is application specific and not systemic and that would narrow down where we have to look. (I am thinking a corrupt or out of date Firefox plug-in).

By any chance does this problem coincide with a Time Machine backup over a network?
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strungCommented:
Another thing to try is to open Activity Monitor (found in /Applications/Utilities) and click on the column heading for %CPU. This will sort the active processes so that the most CPU intensive ones are at the top. Typically, when you get the spinning wheel, one process is using 100% of your CPU cycles.

If you leave Activity Monitor open and re-size your Firefox window so that you can see the Activity Monitor window at the same time, Activity monitor will tell you what process is causing the spinning wheel when it occurs. (i.e. it will be the top process which is showing high CPU usage.)
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klingon4uAuthor Commented:
Only happens in Firefox and happens only when I try to switch from tab tab at top of page (multiple websites open). Does not happen in Safari. What I might do is save my bookmarks, uninstall Firefox and download it again
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strungCommented:
Sounds like a plan. You might also delete these folders:

 /Library/Application Support/Mozilla folder
home/Library/Mozilla
Home /Library/Application Support/Mozilla folder
 Home/Library/Application Support/Firefox folder
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strungCommented:
Or at least move them to a folder on your desktop, then decide if you need them later.
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klingon4uAuthor Commented:
Web search
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