Hi,
When you say that your LabVIEW OI doesn't work, what do you exactly mean? Do you get an error upon launching it? (which one?) Does it launch correctly but you get errors when running a sequence?
This error might be related to the DCOM permission settings in your machine (have you tried it on another machine?). There are some knowledgebases that might help you solve your problem:
1) KB 2KE7MOY6: "Errors when Trying to Run a Sequence on a Remote Windows XP"
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/7b756326ba031e2686256b9c004b6539?OpenDocument
(Even though this KB refers to a remote executions, the solution offered might help you)
2) KB 2HTB9NVW: "Cannot Execute My TestStand Sequences when Logged in as a Non-Administrat
or on Windows NT"
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/2f24f31788d1af10c1256b870064c6a2?OpenDocument
3) KB 1Q0CGHSR: "-18001 Errors When Using TestStand and LabVIEW"
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/55574cb4e0f326df862567fd0077e303?OpenDocument
Let us know if this helped you.
Regards,
Carlos Leon