Make sure you have the latest version of Gigastudio at www.nemesysmusic.com
Try rebooting Windows, wait 60 seconds after getting to your Windows desktop, and try launching GigaStudio again.

Try disabling any network cards in the device manager. This has been known to fix the problem.

If this does not help, something may have gone wrong with the installation of GigaStudio. Try uninstalling and reinstalling.