My Big Problem

I've just got a really big problem. Hope you can help me to leave from this problem. In a couple days ago *till now* I cannot leave a comment. It's not blogger's problem but my WordPress (WP) problem. Since couple days ago, I cannot leave a comment for my friends' blog, and I've no idea bout this..I don't know why it is happen? Is there a problem with my WP? Or problem with my computer, or my network? I only can leave a comment for blog where I signed in. So, can anyone there help me to solve this problem? I really feel upset, coz my friends asked me to leave them a comment in their blog.
Plizz...
Now I know the problem. It was caused my comment is possible spam, so my comment sent into spam on WP. My brother has found it, when he checked his spam akismet page, and he found my comment there. Fiuh..