Yesterday when i go to youtube.com, it says Bad...

Question

I was watching some videos at you tube and when i click on one video to watch, it went totally blank!! t youtube website didn't appear! it only says;
"BAD REQUEST Your browser sent a request that this could not understand. Size of a request header field exceeds server limit.
Cookie: VISITOR_INFO1_LIVE=KOPeXYGgnrk; pref=f1=20&g1=GB&h1=en-GB&fvdm=1; ___utma=27069237.4223536385115945000.1217023689.1224473699.1224479336.80; ___utmz=27069237.1224463442.78

Apache Server at www.youtbe.com Port 80

What must I do to get Youtube website appear again in my computer?? Do I need to delete this cookie or what? pls reply asap. there a lot of videos i wanna watch! ty...