Re: Pre-install them.
Problem fixed!
I was having this problem on a new Windows 7 64 bit machine. All browsers (Chrome, Firefox, IE) constantly crashing, which usually led to Windows Explorer crashing and Task Manager being inaccessible. Only option was was to cut the power and reboot. When browser crashed but Windows still available, could not reload any browser nor stop the browser process in Task Manager. Crashes would occur when opening a new tab. No pattern to the crashes (i.e., based on whether flash was on the site, etc.). Subject tab that caused the crash would load fine when I rebooted and asked the browser to restore the pages open before the crash.
I searched various forums and tried all sorts of fixes. Nothing worked.
Then, I uninstalled AVG (good antivirus program I've used on other PCs). Magic. Everything worked fine again after what had been many hours of frustration and 20x crashed per day.