On Omega 8 the queue folder that GQMgr gets its files from is it is typically located here
C:\ProgramData\Gerber\Omega 8.0\Queue
If you had an older version of Omega installed on that PC then upgrade to 8 it could be in that folder. For example if you had Omega 6.5 and upgraded to 8 the queue folder would be in the Omega 6.5 folder.
C:\ProgramData\Gerber\Omega 6.5\Queue
If you don't find it in those locations check
C:\ProgramData\Gerber\
and see what other versions you have installed and check each one for a folder called QUEUE
in the queue folder you should have 3 items that need to stay
gspplot Folder
SPL Folder
GSP.net File
All other files can be deleted as long as you are not currently outputting to any equipment.