I have done this plenty of times in the past, but it's been a while. I'm pretty sure I am doing this correctly, but wanted to confirm.
1. Wordpad document formated as "ip-address<tab>hostname" without the quotes.
2. Open net_connect
3. Highlight data from wordpad document
4. Drag and drop from the wordpad document to the net_connect probe's left-hand pane where the profiles would display.
I have disabled UAC in windows and also tried it on a couple of different workstations/servers.
Not sure what I am missing.