Didn't do s**t, although I now have a .jagex folder.

After I did the restore, I used IE to get into Runescape. It got me
to the what should have been the loading screen expect it was just
a blank white one.
I reinstalled the most up to date Firefox and Java.
And I still can't play.
Computer Specs:
Windows 7 Enterprise
Intel Core Duo CPU e7400 2.8 GHz
2GB total Ram
32 bit OS
Asus P5KPL-AM SE Motherboard.
No graphics card, I've been using the motherboard one.
EDIT:So I just had an idea.
I tired logging in to Runescape on my mothers computer and was
able to log in perfectly fine.
She however is running Windows XP.
Jagex needs to pull their heads out of their asses.