Lego Harry potter 1-4 keeps crashing, need help!

i have lego hp 1-4 on my pc, it worked fine for weeks out of the blue it started crashing, what can i do, is there a patch or something?
Answer #1
Back up your saves and try reinstalling.
Remove any drivers installed recently.
Answer #2
Try restoring back to an earlier restore and re-installing it, or maybe you could try installing the game and using a different crack?
OFT:Maybe you should take it apart and try re-building it using different lego pieces? I mean Hogwarts could use some Green blocks after all.