Is your touchsmart in the same location as your other computers that had faster wireless (the same room that they used to be in) or in a different location in your house?

Certain building characteristics will affect the way a signal degrades as the waves pass through them. I can have a great signal and great quality in one area of my house, but move two feet and get a crappy signal.

What to do:

First, reboot your router. Turn it off/unplug it, wait a minute or two then turn it back on. Let your touchsmart reacquire the signal and see if things imporove (use geektieguys link above to check your speed)
If that doesn't work, head on over to HP's download site and download the latest wifi drivers for your model. Check device manager first to make sure you know which wifi card you have.
Download then install the new driver then see if it helps.
In my case, with a samsung UMPC that I own, the difference between two sets of drivers was dramatic.
David

http://i99.photobucket.com/albums/l299/xz550rj/HPMagicGiveaway.jpg

Woohoo! I won my Touchsmart!

WELL I HAVE THE SAME PROBLEM. I JUST RECENTLY PURCHASED THE HP TOUCHSMART. I AM VERY HAPPY WITH IT, ONLY ITS MUCH MUCH SLOWER THAN MY OLD LAPTOP WHICH HAD WAY LESS MEMORY. I DON'T KNOW IF ITS AN HP THING OR WINDOWS VISTA. WELL I THINK I'M HAPPIER WITH MY OLD LAPTOP THAN THIS HP TOUCHSMART.