firefox 2.0.0.20 downloadAll my webbrowers dont work, except for Firefox 2.0.0.20?

I tried downloading Chrome, Opera and already have IE installed. The problem is as followed: My firefox works ok, from time to time he decides to closes down, but that is only once a day, not the biggest of my problems.
When i installed Chrome and tried to launch it, IE suddenly opened up and gave me the exact same error when you try to search the net without connection: cannot access webpage or something like that. I tried scanning for viruses multiple times, i use Windows XP 32-bit.. The same thing happens with Opera, IE comes up and opens a 'cannot load webpage'.. Very strange, i have no idea whats wrong. I tried updating Firefox but when i do that, it keeps crashing down, so im stuck with the older version..
If anybody knows anything to help me, i would be very very happy.. thnx a lot
You need to run virus scan and malwares scan.

You also need to update your Firefox as the ffirefox 2.0.0.20 downloadirefox im currently on is 3.5.6

So i suggest that you choose one browser as default instead of other, then uninstall one of them and download it again and re-install, then reboot.

Do the same steps for different browser but other browsers shouldnt act up like that, therefore i think the internet settings in each browser have played at each other..

Try to run ONE installed browser and test it, uninstall rest of them..
Is your Internet connection on? If a large number of your installed programs aren't working, there could be a number of reasons for that. Honestly, one of the best ways to solve this is to reformat your hard drive and reinstall Windows from scratch.
Sounds like a rootkit virus it can hijack your browser but without any windows open it can send you to advertising sites etc.These things can disable normal antiviruses and anti malware. Download "rootkit revealer&qfirefox 2.0.0.20 downloaduot; from Microsoft or Sysinternals and run it, Go to Task manager and under processes see if there is an oddnamed process sometimes just random letters and or numbers and end process. Then go to Start>run and type in msconfig and click OK, Look under the "startup" tab and uncheck the same process name if it appears there. The registry will need to be cleaned up but normal programs should be able to do that when you have disabled the rogue program.

These things can disable recognised anti-malware programs and system tools like task manager, so you may have to download process explorer or killprocess to stop the process, you need also to rename the malware bytes .exe file to, say for example, xxxx.exe or just copy it to the same folder when it will produce a copy called "copy of..." and run that. Instructions on the malwarebytes.org site