Firefox 4 (nor other browsers) do not load web sites but IE can

Hello,
Firefox suddenly stopped work - It was working few days after ver. 4 update. I was looking everywhere for some solution but nothing worked. - uninstalled firewall - '''did not worked '''- added full exception for Firefox into the firewall - '''did not worked '''- Firefox reinstallation - '''did not worked '''- Firefox complete uninstallation (registry including) - '''did not worked '''- IPv6 disabling - '''did not worked '''- diferent proxy options (no proxy, system proxy, autodetect proxy) - '''did not worked '''- new firefox profile - '''did not worked '''- complete coockies, history... deleted - '''did not worked '''- there is only one solution which partly works - I have used public proxy addresses for Firefox but the ping is (750ms), down/up (0.8MB/0.2MB) originaly (10MB/2MB) and yes, I have tried different proxy server from different countries from my including. - IE is working perfectly and without proxy - other browser - are not working also - only IE is working - I have used three different malware, trojans, spyware, anti-virus programs and nothing
It seems to me as hopeless situation or very clever move from Microsoft, I am forced to use IE - at least this works
Any ideas, solutions?
System Windows 7, firewall Comodo Internet security
Thanks everyone for the help

Yes, skype was running that time, but....
1) I do not start Skype automatically with Windows start up.
2) I cannot use any browser for web pages loading
3) it seems to me as something is preventing to browser go to the internet cos firewall never recognized any request for connection to the network.
findings:
- firewall nor defense+ is the problem - we have tried it already - with different conditions and with completely uninstalled
- plugin container.exe cannot be started, but I think that Firefox should be able to run without it
- IPv6 is not a problem
- Skype or Hamachi is not cause of this problem
- Firefox is able to run with manually set proxy server - but is slow
- IE is running regardless everything what is preventing to run other browsers
The easiest way will be to reinstall the windows. I have killed innumerable hours to solve it without success - reinstall is at least sure solution
Anyway thank you for your help

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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