Today I installed Windows XP with latest driverpack which has Ati Catalyst 6.3. But no luck. The same error is occuring. I am not a tweaking guru. I searched www.ati.com for finding solution of my error. But also no solution is found there. I installed fresh windows XP with no driverpack. Then installed official ATI Catalyst driver 6.3 and also installed moded driver called NGO Optimized driver and Softmoded driver from "www.techpowerup.com/softmod/". None of them showed me that resolution error. So, I think the error may be happening due to driverpack. And one last request to Bâshrat the Sneaky, there is still ati control center version of new ati drivers as I see it in NGO optimized driver. Please enable ati control center to install by default (remove catalyst control center), because only a few people (who r tweaking guru) have dot net runtime slipstreamed into their windows xp installation cd. And for this dumb decision of Ati's to make it's driver with runtimes like dot net which does not comes preinstalled with windows xp and very slow in nature due to dot net framework, i will never buy a vga card from ati. They should learn that users try to manage their hardware with softwares that can run fast, easily and with no additional softwares (dot net runtime) install to run it.