I have a PC with intel core 2 duo 2.4Ghz , 4GB DDR2 800mhz (2X2)ram , intel 965 DGRY board, 550W VIP Gold SMPS, XFX 8800GTS 512MB XXX Alpha Dog Edition Gpu, Whenever i try to install windows vista with 4 Gb ram it takes around 15 hours to complete the installation. But when I remove one ram(2Gb)...