You can use the Lola remote with
PC Companion (very limited options in trial version)
It isn't worth trying to get the Lola software (many will confirm this)!
You could also download the X10 USB Wireless Remote Drivers:
version 3.239Which will give you control of Windows Media Player and or Windows Media Center
It will also allow you to control your PCs master volume and put it into/out of standby.
Note: Some have reported strange behaviour with AHP after installing this driver.
XP may or may not state it needs a reboot after install (it does need it)!