HP g62 a10EM switchable graphic problem

i have a HP g62 a10EM which come with a AMD M880G with ATI Mobility Radeon HD 4250 and a
ATI Mobility Radeon HD 5470 it has a PowerXpress function , yesterday i installed a new system (win 7 home 32 bit) and installed all drivers from the HP site that i used before and the problem is that i cant seem to switch between a power saver GPU and a high performance gpu ( from a 4250 to 5470) i have never had nad problem , tried all drivers , updated bios sometimes an error 43 shows in device manager for ATI Mobility Radeon HD 5470. hope we find a solution to this
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  1. also tried uninstalling the graphic cards completly from device manager and lettin windows find it and reinstallin the driver then , also got nothin
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