can't post to form boxes

hello... lately we can't post to form boxes, like the bodies of e-mail
(yahoo!) and web blogs (xanga and blogger). does anyone know why? i ran
windows update and rebooted just now, but still no dice.

also, lately the websites we visit suddenly links certain words - when you
click on those links, you go to NT search. can someone please show us how to
make this stop?

hope someone recognizes what might be going on with my iexplorer. should i
reinstall explorer? if so, where can i get an update?

thank you!