UGH

I AM SOOOOOO MAD! LAST WEEK END I WAS CLEANING OUT MY COMPUTER AND THREW OUT SOME STUFF FROM QUICK TIME I DON'T USE THAT SO I TOSSED IT BUT THEN IMOVIE WON'T WORK AND SO I TRIED DOWNLOADING IT AGAIN NOPW THEN I TRIED DOWNLOADING QUICK TIME AGAIN NOPE NEITHER!!!!! NOW I UPDATED MY COMPUTER SOFTWARE AND NOW IT'S ITUNES 10.0 BUT NOW IT WON'T WORK RIGHT EITHER!AAAAAAAAHHHHHHHHH WHAT SHOULD I DO ITUNES KEEP CRASHING!