Hi Joe,
Thanks for your reply..
I guess issue is with Ram.I have removed 4 GB ram which is having speed of 1600Mhz installed in channel b dimm1 .After removing ram I am able to install windows 7 64 bit operating system .currently there is only one ram which is 2 gb with speed 1333mhz in channel a dimm 0.
could you please update me whether this mother board supports 4 gb ram with 1600mhz speed.Please provide me the document which contains proper way to place ram in motherboard.