Firefox won't open at all since May 4 update, yet no error message appears. Am not savvy/brave enough to test for corrupt Profile data. HELP, PLEASE!

Tried to start Firefox 3.6.16 from Desktop May 4. Instead of opening, message showed an update in progress, then a message that it could not install because two Firefox programs were running (?). After the install message closed Firefox wouldn’t open from the Desktop, the Start Menu, or the Run command. I’ve rebooted numerous times & even did a System Restore to May 3.
C:\Program Files\Mozilla Firefox currently shows only one firefox.exe, last modified 03/23/11, and the only changes May 4 to chrome folder (6 Executable Jar Files), components folder (browser.xpt), & blocklist.xml.

Thank you very, very much for providing the simple, concise directions that solved my problem! After sorely missing Firefox 3.6.16 for a month, today I finally worked up the courage/got desperate enough to attempt (with much trepidation!) the download and re-installation.
Step 4 was a bit of a challenge, but following Uninstall directions in the 3.6.16 Release Notes advising removal through Control Panel appears to have preserved my Profile and worked fine. Was not quite sure how to go about properly removing the Firefox program folder, so I opened Local Disk (C:)/Program Files/ and deleted (to Recycle Bin) the Mozilla Firefox folder – and am keeping fingers crossed that that was the correct method.
It was quite a satisfying thrill when Firefox 3.6.17 opened, but very distressing to note that “Firefox 3.6.x will be maintained with security and stability updates for a short amount of time. All users are strongly encouraged to upgrade to Firefox 4”. Sadly, it seems all things Internet seem to be evolving towards mobile devices, social networking, and the ability to sync all the fancy new toys – and getting much to complex for us old dogs who don’t learn new tricks easily, or need them for that matter.
Thanks again!

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If this SAME problems is effecting us all then suspect its not IPS problem as we all get problem at 995.6MB.
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you...tried the flash player fix you included, no dice. thx though
plugin-ins
Adobe Acobat 11.0.0.29 ''ask to activate''
Java Platform SE 8 U25 11.25.2.18 ''ask to activate''
Java Deployment Toolkit 8.0250.18 11.25.2.18 ''ask to activate''
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Nvidia 3d Vision 7.17.13.4448 ''ask to activate''
Nvidia 3d Vision (streaming plugin) 7.17.13.4448 ''ask to activate''
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Norton Toolbar 2014.7.9.8 Disabled
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OS Name Microsoft Windows 7 Ultimate
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Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name xxxxx
System Manufacturer System manufacturer
System Model System Product Name
System Type x64-based PC
Processor Intel(R) Core(TM) i7-3930K CPU @ 3.20GHz, 3200 Mhz, 6 Core(s), 12 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 2003, 6/29/2012
SMBIOS Version 2.7
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume2
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name XXXXXXX
Time Zone Hawaiian Standard Time
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Total Physical Memory 15.9 GB
Available Physical Memory 11.8 GB
Total Virtual Memory 31.9 GB
Available Virtual Memory 27.6 GB
Page File Space 15.9 GB
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Firefox won't open at all since May 4 update, yet no error message appears. Am not savvy/brave enough to test for corrupt Profile data. HELP, PLEASE!

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