You might take a look at this doc http://community.landesk.com/support/docs/DOC-21959/version/2
I came across your post and this doc looking to identify what ResolveUserGroups.exe.
On our server, we noticed network spikes while monitoring for an outage event, and traced it back to ResolveUserGroups.exe. It did not cause any issues for us, but thought I would pass along the info in case you were still searching.
I hope he was successful LAST YEAR