BleepingComputer.com: My Internet is being weird.

Mozilla keeps on crashing when I go to most websites. It'd probably be easier to list the ones I can go on than the ones I can't. Also, it's not just Mozilla firefox. It is also Internet Explorer. I tried doing scans on prevx. Also, it must be some problem with my internet as the same thing happens in safe mode as well.

And for some reason, I can do certain things on websites, but not all of them. ex, I can go on photobucket, but when I try and log in, the internet will crash.
If I go to youtube.com, my internet will crash, but if I go to a video without going to youtube.com first, it will not crash.

I doubt this matter, but I have a Windows Vista desktop computer.