So.. I try and download patch... first, the compy crashes...
Fine whatever... Probably needed a restart anyways...

Try again, game won't accept patch...
Okay... bad download...

Another download site and half an hour later...
Game still won't accept patch... says I should reinstall WoW...

1 hour later... Installation freezes on third disk... computer crashes...
Should try the other hard drive...

Yet another hour later... Install frozen at 3rd disk again...
And that's where I am... Been frozen for half an hour... Task manager says it's running... I've taken out the disk and cleaned it, tried even going over to the fourth disk...

Why do you hate me? Why???

check the official WoW site. they have a guide for how you can copy the contents of your disks onto the hard drive and install directly from the hard drive. my friend had a similar problem to yours and that's what worked for him.