Somethign very strange has happened with windows, and i fear that my lil brother had something to do with it...

ok here goes:

  i have windows2000 and everythign was working fine, but a few days ago something went wrong with the computer and now explorer doesnt work(not internet explorer).  it runs fine when i end explorer on the running proccess sheet in the task managager, and i can navigate slowly through files by constantly creating new tasks, but whenever i TRY to run explorer again it ends up freezing so i jus ctrlaltdelete it and end process... anyways, i DONNO wat could have gone wrong, PLZ HELP :-/oh we do download ALOT, but i manage all of that, and i make sure we r protected, i use avg antivirus, ms antispyware beta,

i am not skilled enough to actually look at what drivers are missing or what the problem could be... hopefully i'll train and learn soon, but i did a virus scan as soon as thsi happened and cleaned out everything that was found... maybe a virus took a nice bite outa windows, where it counts?!?Boot win2k......to the last good config.......just like winxp hold down the down the f8 key on boot and chose the last good config for the on screen list............or if the fails chose START pc from the cmd prompt.
then type help/?.........this will bring up alist of commands....sfc/recover .......etcAre you restarting Explorer from C:\WINNT\Explorer.exethnx fed, but YEA i was doin it

merlin....  so i boot with F8, umm but wut do u mean the last good configHave another read of my reply........