G'day. 1st time user. I have a new system which had Win 7 RC loaded. Tried to install Win 7 Home premium 64 bit without success. I installed Win 7 Home premium 32 bit no problem. I would still like to install the 64 bit version. I cannot get the system to boot from the 64 bit DVD that comes separately from the 32 bit DVD. My system has a Gigabyte EX58-UD4P motherboard with Intel Core i7 920 CPU, 6GB DDR3/1600 RAM. The C: drive WD 300GB 10,000RPM HDD. 2 x WD SATAII 1500gb 32MB HDD. nVIDIA GTS250 1GBDDR3 Graphics Card. The system has no software installed other than the Operating System. Any suggestions would be much appreciated.