Firefox won't start after download and update

I have win 7. I uninstalled Firefox and downloaded it again.
The icon appears but the program won't start. I am so used to Firefox and don't want to use IE.
I get a few messages:
XML Parsing Error: undefined entity
Location: chrome://mozapps/content/extensions/update.xul
Line Number 14, Column 1:
<wizard <="" ^="" id="updateWizard" p=""></wizard>
I also get a message:
"There is no disk in the drive-insert a disk into drive/device/hard disk4/dr4
I uninstalled Firefox several times , still no luck
I hope you can help me resolve this problem.
Dkmc7

Well I use system restore to an earlier date in May.
Then I uninstalled all Mozilla files and then I reinstalled Mozilla 29.0.1 and
now my Firefox Mozilla is working fine with all info in my profile intact.
Thank you

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I cheated a little bit and put the issue url in a working version of firefox:
chrome://mozapps/content/extensions/update.xul
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blah blah parser:
<pre><nowiki> xml-stylesheet
xml-stylesheet
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Firefox won't start after download and update

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