Vista - vista is blocking my machine to launch mozilla, chrome or safari, can any body help

I just got a new machine with windows vista pre loaded. every thing worked fine but when I tried to install an internet browser other than internet explorer (mozilla firefox, google chrome, safari), it allows me to down load, install, but when the new browser is about to launch, the machine sends a message (for mozilla), that says "the security component for the application could not be initialized, most probable cause is, problems with the application profile directory files,(for google chrome) installation error No 2, (for safari) it just frozen. I have tried every thing I know, that it is very little, because I am not a computers man, I am an user. I setted the "privacy" rectriction in Internet options" to allow the new program to go through, same I did the same for the "fire wall", and "emerging" elements, and still can not get any of these internet browsers launched in my machine. I will appreciate any comment or direction that might help.