When I try to open Firefox I get a message: "Update could not be installed. Make sure there is not another instance of Firefox. Restart and try again."

Started w/FF 29 something.on Win XP (Home) SP3
Verified w/Task manager and PS that there is no other instance of FF.
Occurs only in my profile, administrator and other users do not get this message.
First Resetting, did not work.
Safe mode also did not work.
Uninstalled completely, even deleted the Firefox folder from my profile and rebooted.
Downloaded new versions, installed and same issue.
Firefox now version 33, all seems up to date but I still get that message. When I open Help > About it says I am at version 33 and to restart to upgrade...
Any ideas greatly appreciated.
Have reverted to SeaMonkey for now.

Hello sprytely, go for a clean re-install, this means you '''remove Firefox program files''' and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from the next full installer https://www.mozilla.org/en-US/firefox/all/ and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
<b>WARNING:</b>Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. <u>These cannot be easily recovered unless they have been backed up to an external device!</u> See [[Back up and restore information in Firefox profiles]]. <!-- Starting in Firefox 31, the Firefox uninstaller no longer lets you remove user profile data.Ref: Bug 432017 and https://support.mozilla.org/kb/uninstall-firefox-from-your-computer/discuss/5279 [Fx31] Windows uninstaller will no longer offer the option to remove personal data -->
Thank you.

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