Firefox has become corrupted & will not execute, I need to download a new copy to another computer, burn to a CD & reinstall on my maun PC...
I need to download and reinstall Firefox on my main PC, but Firefox appears to have become corrupted. (Microsoft Essentials scan found a Trojan & removed it... The problem?) Neither Firefox or the Internet Explorer, (that I don't normally use,) will connect. After entering an address in the address field, both immediately blink, remove the entered info, and reset to receive a new address. Can I download to another working computer, copy to a thumb-drive & then install it on the desired computer?
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Using another computer, Download Firefox Full Version For All languages And Systems {web link} onto a thumb drive. After, plug the thumb into your system.
You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.
Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.
As to IE; Perform a System File Check to fix corrupted system files Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833 Win XP: https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/system_file_checker.mspx?mfr=true
See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration