Try a PCI USB card - they cost about £15 - £20 and might do the trick for you; often they are much more successful than are hubs.
Just check that there is a spare PCI slot (or one that you can remove something else from).
Another possibility is a BIOS upgrade, but check first with the manufacturer of your mobo; they should have an online presence somewhere or other. Try aida32 click here to identify the mobo. Maybe the latest drivers for the mobo and/or chipset may help also.
Sorry, I don't know anything about hyperterminal.