well going primitive, you can find those AV wireless transmitter/receiver. head-end connects to touchsmart via the Aux out and the sound will be wirelessly transmitted. the remote end will receive that signal and convert it. the remote end is going to be connected to a stereo input of your receiver. and there you go....

you can try ebay "AV sender"

beware though as it also operates on 2.4GHz. make sure your wifi channel is kind of away from the AV sender's.

yeah it can stream whatever audio is going to go out of your aux output or headphone input.

there's also a USB version in ebay where the USB end connects to the PC [and powered via usb too] and the remote end to your receiver or speaker system.