Hi, My old laptop (HP Pavilion dv9500) currently has Windows Vista 32-bit, and I have been using it for a couple of years. I recently upgraded the hardware to be ready for the Windows 7 installation, which I will do soon, and now it has 4gb, one 750gb 7200rpm HDD, one 250gb 5400 HDD, and an integrated graphics card and CPU (AMD Athlon x64 1.8ghz). I was wondering if I could go for a 64-bit installation, or if I should stay with a 32-bit installation. Also, can I overclock my CPU/Graphics Card? Thanks!