I need to install Firefox, but every time I try and download it, the downloaded file is corrupted and I cannot install Firefox on my Windows 7 Desktop PC

I had Firefox installed as my standard webbrowser, but recently it started having problems in regards to websites, some websites wouldn't work as they should. For instance I couldn't open my hotmail email account, it was just a blank white page. Or I would get just code and text on a site that I would normally see images and a designed lay-out. The problems started after I used a demo PC-cleaning program, which removed unnecessary files from my computer. I figured it removed necessary files for firefox to work properly. So I uninstalled Firefox using the uninstaller (but keeping bookmark information etc.) and tried dowloading Firefox 5.0 but the download always crashes or gives me a corrupt file

Do a clean (re)install:
* Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Don't remove personal data when uninstalling.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
You can initially skip the step to create a new profile, that may not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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