Since this shortcut works perfectly, it is very unlikely that a background programme could be the cause. I have even closed Min2Tray from my ProxHTTPSProxy programme, but this has had no effect. Apart from that, it only minimises windows and does not hide them. Otherwise, no other window manager is running in the background here. If I understand you correctly, then calling VTHash.exe by double-clicking works for you under Windiws XP. Is that correct?