Hi nikola, I'm glad that you found a solution, but that's a somewhat odd problem to get an improvement from just changing to a 16-bit desktop color resolution.

I would say that probably indicates some problem with your graphics drivers.

Windows XP 64-bit is a kind of odd operating system and I would not be surprised if your drivers for that particular operating system are not quite as good quality as they would be for XP 32-bit or for Vista or Windows 7 64-bit.

You might consider migrating from XP 64-bit to Windows 7 64-bit where you will likely be able to find better quality drivers.

In the meantime if switching to 16-bit color works better, then that's certainly ok but it's kind of weird and does not give me a lot of confidence that you have a very good video driver on there.

- Michael