Firefox crashing & wont let download AVG or Malwarebytes' Anti

Firefox is crashing when I google - avg, antivirus or Malwarebytes' Anti-Malware etc. I managed to get AVG but my laptop wont let me install it - it extracts by 1% and then dissappears. I tried reinstalling Firefox - no joy Zone Alarm is working - 3.tmp and 43.tmp are trying to access the internet. I have tried download.com for Malwarebytes' Anti-Malware but even when I load the page Firefox crashes. I have tried installing Internet Explorer - it installs but I cannot find it, on the desktop, c - drive, program files etc. Its all very odd. If anyone has any advice on how to fix this I would greatly appreciate it

Closing, duplicate topic:
http://forums.whatthetech.com/Firefox_cras…nti_t99653.html