Right, my internet is fully connected to broadband via a wireless CONNECTION to the router. Firefox is my default browser and will only work when in safemode (otherwise it will just crash). In addition to this, Internet Explorer does not work and MSN does not connect, stating that it is not possibe due to me not being connected to the internet which obviously is not the case.

Please please please HELP!!!!!!!!

Btw I am using Microsoft Vista

Thank you for your time and help.How do you know the Internet is WORKING if you can not open a web browser to check?

Can you reinstall FireFox by downloading it from another computer onto a flash drive, and installing it again?

What Antivirus PROGRAM are you running? Are you always booting into SafeMode? (Safemode often will not work properly with WiFi, and even then it is not suitable to run your computer in Safemode all the time).
Can you plug directly into the router? Assuming you mean safemode in firefox and not safemode in windows then one of your plugins / addons is unstable with your version of firefox. That's why when you enter safemode in firefox, which disables addons and such, firefox works. So use safemode and when you open firefox remove your addons or make sure they are disabled. It will be a pain if you have dozens of addons but that's how it goes. Then eventually you will be able to open up firefox "normally". It's probably the same thing with IE. As far as MSN I don't use it so I can't comment on it.