I have a problem with my internet explorer......

[-apu-]

My internet explorer is messed up, see, what happens is that when theres anything running that takes up a moderate amount of ram (e.g. Kazaa, MSN, and so on) my internet explorer will just freeze and it'll say, error has occured and blah blah blah, everyone knows that message, but anyways, Happydude666 recommended that I get the Windows Update, but now the problem is that you get the updates fromt he internet, using internet explorer, and right when i'm about to Download them the f**kin message shows up again, i've degfragmented my hardrive, i've used scan disk, i've deleted all the programs i don't need, and i've checked for viruses, I'M CONFUSED!!!!!
Can anyone help me??????