Hi. So i was helping my friend to REFORMAT and install a new Windows 7 Ultimate 64-bit OS. It is Acer Aspire V3-471. However the installing process go through well and no problem occured until I when take out the CD and load into the OS but it went to BSOD right after the WINDOWS IS STARTING UP screen...can anyone here please help...It was my friend's notebook...I had never encounter these problem before... Please...