Try to start Firefox in Safe mode. This mode disables all extensions, user customizations, hardware acceleration, etc. temporarily for diagnostic and troubleshooting. If Firefox works find in Safe Mode, then this is likely an add-on issue. Restart Firefox in normal mode, then type "About:addons" (without the quotes) in the address bar. Disable your extensions one by one, restarting Firefox between each one, until you find the trouble maker. Once you do, you can disable that add-on and report the issue to that add-on's developer.

A few other basic trouble shooting things you can try is this: Run all Windows Updates, install all needed service packs, etc.

Update your graphics driver (Firefox uses your graphics card for some rendering, and an out of date graphics card driver can cause problems. https://support.mozilla.org/en-US/kb/how-do-i-upgrade-my-graphics-drivers.

Update all your plugins (Flash, Java, etc.): http://www.mozilla.org/plugincheck/.

Download and Install MalwareBytes Anti-Malware, run a full Scan. http://www.malwarebytes.org/. This helps check that there are no viruses on your computer causing issues. You can uninstall this program after you clean off any infections.

Also, try reading Firefox crashes, it has more useful information on troubleshooting crashes.

Now, your download being corrupt sounds like a problem with the browser you are trying to save it with. If you are using Internet Explorer, don't click run, but instead click "Save". Then double click the file after it is finished downloading.

The linked crash report is empty (@ EMPTY: no crashing thread identified; corrupt dump) and doesn't include any data, so it is not possible to find the cause of the crash.

That crash report shows that you are using an old Firefox 8.0 version, so you can try to update to the latest Firefox 11 version to see if that helps.

You can find the latest Firefox release in all languages and for all Operating Systems here:

• Firefox 11.0.x: http://www.mozilla.org/en-US/firefox/all.html