Uninstalled firefox 4.0 because I didn't like the upgrade, now I cannot access the internet.

I have a laptop, and internet explorer hasnt worked for a long time, so I've been using firefox. I upgraded today to 4.0 version, and instantly hated it. I uninstalled the program, which I now know was the wrong way to do it. Then it completely disappeared, and I couldnt access the internet. I then did a system restore back to yesterday, and it put the icon back on my screen, and shows the program in my files, but it wont open.
I am panicked since I NEED to be doing things on this laptop today. Right now I am using another computer, which is in the same house.
Also. when I go to firefox from this computer, it takes you to ask to download 4.0. this computer doesnt use firefox. so, i need help ASAP i beg of you, and also, once fixed, do I HAVE to use 4.0? or is there a way to use a previous version?

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox
If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

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