Recently I've noticed that Windows Media Player will not play a new file (video or music) if it is closed, and commanded to re-open straight away. Looking at it in Taskmanager, the process continues for about 10s after it's closed; the GUI disappears immediately. Once the process vanishes from Taskmanager, the player can be re-opened normally. Tried a registry clean with CCleaner, an optimize with Iobit's AWC, uninstalling and re-installing the media player, from a fresh download from MS, all no go. Some guru help and advice requested, please. Windows XP SP3, (was working fine for a while with SP3), Avast Av, Threatfire, Comodo Firewall 2.4. AMD 3500+, 2G RAM. Nothing changed recently.