Getting Logged out when i try to post......HELP!!!!

[Mathewsboy]

On my computer at home, everytime i go to post or reply, i get signed out and it say i need to be a member to post or reply...
I dont have a firewall or popupblocker installed. I have also cleared all my cookies, defragmented and so on...

Any suggestions?

I can only post here at work.....

I use Windows XP at home..

[strut]

When you are at home make sure you are not logged in as a guest.