I am unable to use the single click to select people, vendors, and buy items (sort of a problem). I'm on Vista so it's probably just giving me crap again. Can i do something options or am I screwed?
It could be your mouse acting up and it may need to be replaced.
Try resetting the options on your mouse. I had to redo mine to make the center scroller thingy do the things the left button did. Took a while to get use to but it works.
Also make sure you're not in war mode when buying from a vendor. I know that messes me up sometimes.
The single click menu is an option you can set on your paperdoll as well. Check and make sure your options are still set for single click to work.