Q: When I open G-Manager it spins like it will open but that will just disappear and G-Manager never opens. Is there a way to resolve this?

A: Please Follow these steps to rebuild your sysWOW64 performance counter.

1. Open Command Prompt as Administrator
2. Type cd c:\windows\sysWOW64 and press enter
3. Type lodctr /R and press enter
4. After it rebuilds successfully type WINMGMT.EXE /RESYNCPERF and press enter to resync counters
5. Try to open G-Manager and it should open now

If this does not correct the issue look at full walkthrough for resetting counters at the below link:
Rebuild Performance Counters