GNU GRUB

I have 1GiB of memory DDR2. I tried installing the update for Firefox when I went to the website but it froze again. But it seems to have an issue only when on the network, I think. When it's busy, then I open up another file, the window behind the active folder turns white, everything on it like dissapeares and all I see is a blank window (sort of like what happens with Windows OS when a program crashes). The same with the Internet Browser, I click on a link and a lot of it turns like a purple color and I'm not able to see the text or anything. ???

I am currently downloading the updates for Fedora, I hope that helps.