Fixing Users Online?
 

I've realised in the who's online box and in user's online in admincp that it isn't working

I think it's showing overall...

Is there anyway I can fix this?

My guess is that most of those 'guests' are spiders - and I'd even guess that most of them are yahoo! slurp spiders since they love to come en masse.

What makes you think it isn't working correctly?

It doesn't change...
Instead it carries on going up and I'm still getting my site to work with search engines, most of the guests are of some toplists I've recently advertised on and advertising site's

What is your session timeout set to?

When you say it doesn't change, you mean everytime your are on the forum, it always says 7 members 353 guests and it lists the same 7 members in the current active users list?

I mean it never goes down, everytime someone new comes to the forum, the guest count will go up, but it's not like I have 360 guests on at one time.
How do I find out my session timeout?
Thanks

vboptions > cookies and http header options > session timeout. Default is 900 (900 seconds or 15 minutes)

Well it was very long.. :S
I set it to 900, will that fix it?

I would guess that 900 will fix what you are seeing. Change it and see.