for the last 2 days every time i try to log in to my gmail account i get a "Bad Request: Your client has issued a malformed or illegal request."

this is the page that pops up:

http://mail.google.com/mail/?hl=en&tab=wm

   i've looked around and can't find any info/news about this and how to fix it. any suggestions would be extremely helpful. thank you-

Well, when everything fails you can search in the help center! ;)
http://mail.google.com/support/bin/answer.py?answer=91343&topic=12780

Clear your browser's cache and cookies!

Hope it helps :)