Need help with a .sys file?

i need help i installed my a4tech PK-750MJ but i need the file usbvideo.sys version 5.1.2600.0 i lost my xp cd so i cant really get it i dont know why its not in here.I asked for a copy of usbvideo.sys from a friend online but the thing was its a diff version whenever i try to activate my cam on camfrog or on yahoo messanger they error and close due to a bug then theres a reference error can anyone help me?