In Start Menu\Programs\Startup there should be a shortcut to GBPVRTray.exe. It is only created for the user that installs GBPVR, so if you install while logged in as one user and then log in as someone else it won't be there. You can either re-run the installer & choose repair, or just create the shortcut manually.
P4 3.0 Ghz (hyperthreaded), 1024 MB DDR
XP Pro SP2
20 GB system drive
2x 250 GB data drives, RAID 0
Hauppauge PVR-350
Hauppauge PVR-150MCE
Hauppauge PVR-500
3x Hauppauge MediaMVP