Hello,
Since you're using VISA with serial, don't worry about serpdrv. Visa does not need it. You always want to match the versions of the LabVIEW and VISA runtime engines on your target machine with the versions on your development machine.
LabVIEW 6.0 shipped with VISA version 2.5, so unless you installed VISA 2.6 serparately, you probably have 2.5 on your machine. Also, part of the LabVIEW 6.0.2 update includes a seperate part for updating the Application Builder, that involves replacing an msi file, make sure you performed that step.
If your versions match then you are probably just missing some VISA aliases. (A VISA resource name will show ASRL1::INSTR instead of com1 on the target machine.) If this is the case you can just select ASRL1::IN
STR or make a couple changes in your visaconf.ini file of your target machine.
Ray K
NI applications Engineer