No need for duplicate posts in multiple forums, this is the right place for it.

Wireless issues are common, getting by them can be a bit tricky, first off how is your wireless network set up?
SSID broadcasting? not in conflict with another local network?
What kind of security? WEP, WPA, none?
Does your Desktop see any other networks?
Have you told it to forget this network and look for others? if so does it find them?

Those are all the questions I would start with in troubleshooting a wireless problem, it's not "Touchsmart specific" it's "that particular computer" specific"

I have same issued just started with my IQ500. First the mouse stopped connecting, then the keyboard....now IQ can't find the network. I removed the USB-type adapter in the back, and re-inserted it. Now the mouse and keyboard are working again but it can't find the network. I use an Apple Airport and all other devices in the house connect. I even reset the Airport and established a new network, new network name, new passwords - using a different computer. All other devices can find the Airport. The IQ finds my guest network only (also on the Airport) but can't connect to the internet - it states limited access and low signal - but the Aiport is sitting right next next to the PC.