That's just Internet Explorer. In my experience, Internet Explorer freezes up and just generally sucks no matter what your specs are.
But it just sounds like your Toshiba is basically on its last leg, if you had to replace the memory to even install the operating system. I mean, that's pretty bad corruption if the Windows installer wouldn't even let you continue.
If I were you, I'd put that Toshiba to rest. Harvest some parts from it, perhaps, if you're sure that they're the working ones, but I would just let a dead dog lie.