"mark forums read" 404 not found error

[roekbarnet]

I hoping I can get some help here since I am a complete newbie at this. I am running vBulletin 4.2.3 and I get a "404 not found error" whenever I click on the "mark forums read" link at the bottom of my forum. I also get the same error when I click on the banner at the top of my forum. Can anyone give me directions on what I can do to fix this? (hopefully it isn't too complicated).

TIA