Explorer Bucking Froken

Hey guys, windows is wonderful:

1. Explorer boots up frozen.
2. Restarted, quicklaunch and toolbar works, but clicking on the desktop or
   start menu freezes it again (as does <Windows-key>-R).
3. Task Manager works, allows me to run programs.
4. Went to M$'s site, downloaded updates, rebooted, still broken.

Running Windows XP SP2 on HP Pavilion zd7010 laptop (the one with a numeric
keypad).  Last thing I did was turn it off by holding power because it failed
to wake up from sleep state (oops?).

Help?

>>5
Format won't clear your data