Would appear you have a 9800 then. THere is no such card as a 1900, but was thinking you had a laptop or something with built in ATI Graphics for a minute there, as there is a 9100 IGP which is for Onboard Graphics.
ANyway, as mentioned in a previous reply i posted here. Have you tried removing the whole of the Wireless connection from your system and trying it without that connection.
Do you have a Wireless PCI card or some sort of USB Wireless adapter and either of them have drivers installed. If so, then i suggest removing them first then try the installation again.
Also, being that both machines are located on the same network, have you checked both of these machines for Spyware or Adware and even Viruses/Trojans etc.
Try checking for the SPyware stuff first. Spybot, Adaware and MS Spyware are all very good free to download programs from the internet.
If anyone knows of any others that are just as good or better, please feel free to add them.
Once you have tested for that, then try the reinstall again, especially if you detect some sort of mischief going on. If that doesn't work, then i suggest removing all wireless function from your PC and try the install again.
