Where do you see those errors?

In the eventviewer or somewhere else.

From my experience when you start the SQLH2 Performance Collector, for each counter one or more entries show in the application log. If any counter fails an error will be recorded for that counter specifically. One failed counter will result in total failure to import data into the SQLH2Repository.

Also on where are you running the collector server? Is it on the same server as the target server or a different one.

Have you checked that all the performance counters exist in system monitor?

Do you see any files created in the SQLH2\PerfCollector\Data folder?

Have you tried to start sqlh2.exe manually?

Markus