where can i increase it from and what is the reccemonded level
Generally, it's best to set your paging file size to 1.5 x or less the amount of physical memory you have. eg if you have 512MB ram, set it to 1.5GB
just to add with Indyan's post... here is a easy stape by Stape guide from MS...
*support.microsoft.com/kb/307886