I updated to Firefox/Mozilla 5 and can't open it - deleted download and reloaded but still nothing

I was running the former version of Firefox/Mozilla and was notified to update to the newer version of 5 which I did and have not been able to open it at all. I have enough hard drive and memory to run it on Windows XP operating system. Tried to go back to the older version but can't do that either. Right now I am using Opera but would much rather use Firefox as I liked it a lot. I am upgrading to another computer soon running the Windows 7 Professional - do you have any reports of Firefox 5 being unable to run on Windows operating systems?

There are a lot of Firefox 5 users still running Windows XP, but everyone's memory and drive space and graphics are a little different, so it's hard to make a blanket statement.
I recommend backing up your Firefox settings in case something goes wrong. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, download and re-run the Firefox 5 installer to see whether that corrects the problem.
http://www.mozilla.com/firefox
If the installer won't run until you exit Firefox, the program may be hung in memory. You can use the Windows Task Manager (Ctrl+Shift+Esc) to shut it down. Check both the Applications tab and the Processes tab.
Does that help?

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What is the precise wording of the message that is occurring?
Are you attempting to update via iTunes on a computer or over the air on the device?
How much free space is actually on the device?
If updating via iTunes on the computer, how much free space on the computer?

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Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
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After updating to Firefox 5.0 I can't open Adobe pdf's on websites and in the preferences for Firefox it states it's incompatible. If this is the case how can I get the old version of Firefox back?

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Sorry you are having problems. First of all try Fifrefox's safemode.
*[[Troubleshoot Firefox issues using Safe Mode]]
If that works post back for further advice.
Next step, if safe mode did not work.
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* this recent post [/questions/940399#answer-377134]
* http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
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*http://kb.mozillazine.org/Profile_Manager#Creating_a_new_profile
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**[[Back up and restore information in Firefox profiles]]
* Until you are absolutely confident about the repercussions I suggest
** always use an empty folder when creating a new profile
** never delete or rename profiles, just disable or remove shortcuts
** after creating a new test profile open it and check for any addons or plugins that may be have been included by default

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Try This...
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I updated to Firefox/Mozilla 5 and can't open it - deleted download and reloaded but still nothing

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