The temp of the computer won't matter - the temp of the wireless router or the temp of your wireless card would matter.
If the rest of it works, your computer is fine and not frozen.
If the browser is frozen, then it is either an issue with the browser, the network card, or the router.
If your computer puts the card to sleep for powersaving, but then doesn't bring it back up properly, that could be bad and look like that.
Or it could be a memory leak in IE.
If you kill IE (not just close it by the little X in the corner, but open up the task manager and "end task" the process - not the task process, but the process under the "processes" tab - should be "IEXPLORE" or something like that), and then start it up again and if that works - then the issue is with IE.
If that still has the problem, then the issue is with the card or the router.
If the problem is with IE, then it is something outside of the program since this isn't a known issue.
So you either have a virus, trojan, worm, or spyware.
Spyware would usually shoot you up a lot of ads though...