One suggestion to speed up the process: 

1. screen shot / keep track of which programs are enabled

2. disable all startup programs, then test. If you can't connect, then you know none of those are issues.

Hopefully you can connect at this point; if you can't, there might be some Windows setting that's different, but I wouldn't know what to look for off the top of my head either..

If ProSeries can connect at this point, re-enable about half the programs, and test again.

Repeat the last step and you should be able to narrow down on the program that's causing the issue without having to restart too many times.

Best of luck! If you do find out which program / setting is causing issues, please update this thread.