I use latest version of Firefox on my Windows XP SP2 and when I try to launch Firefox it only says couldn't load XPCOM and also no one of others browsers( I tried IE, Chrome) doesn't works, simply they do nothing- Please HELP.
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Then something is majorly wrong with your machine. Take it to a local, reputable computer repair shop, tell them you want to use Firefox but none of the browsers on your computer work. They should fix the machine, updated it, remove any viruses and you should be good to go.
Well we can't really help you here. You can try downloading the tools I gave you a link to on a another computer and put them on a USB drive, but diagnosing a whole computer problem is beyond the scope of this site.
then reinstall windows xp from scratch
Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.