Dear Junnikka,
According to your update, I think we'd better clean the nwetwork connection
for your Groove and then test the results.
For your convenience, we can refer to thest steps.
1. Right-click on the Groove icon in the system tray, and choose Exit
Groove (Shut down Groove in 2.x version).
2. Click the Windows Start button and choose Run.
3. Browse to C:\Program Files\Groove Networks\Groove\Bin and choose
GrooveClean.exe
4. In the Run box, the command line, should type:
C:\Program Files\Groove Networks\Groove\Bin\GrooveClean.exe
5. Click OK.
After these steps, please let us restart the computer normally and then test
the results.
For more information about using Grooveclean, refer to the following technote:
How to use GrooveClean.exe to clear communications queues or remove all
Groove data
http://www.groove.net/support/kb/detail.cfm/docnum/TCN-00312