Windows 8 Microsoft

I just installed latest unstable build 2.3.1272. The entire installation process was allright, when I run the program it prompts the UAC, I hit on Yes, the cursor implies like it's loading but it doesn't open a window.
I check on Task manager and the process is running (it even shows to be using 50% of my processor) but a window never shows up.

Thanks in advance

Windows 8.1 - 64 bits

I tried testing what I could and everything was allright, but I tried closing all windows and cleaning but I always got this error:
Error in execution of Command to delete C:\Windows\winsxs\poqexec.log

Thank you.