Update from me.
Works fine on my brother's laptop (RomRaider, Hyperterminal, viewing, logging, etc). Windows 7 64 bit. Beta build of RomRaider. Installed proper driver's for the OBD cable and serial cable. Baud rate set to 9600. Works with or without logging ECU data (can log AEM UEGO by itself).
Does not work with RomRaider on my laptop. Just reads 0. Works fine with Hyperterminal. Windows XP. Beta build of RomRaider. Same drivers for ODB cable and serial cable. Baud rate set to 9600. COM port does show up in RomRaider, and is not being used by anything else (Hyperterminal is closed).
Basically it should be set up identically between the two computers, but it will only work with RomRaider on one of them. But it will work with Hyperterminal on both. I'm just not sure why RomRaider won't pick up on it. Any ideas?