I have a Dell Optiplex GX 620 System that came with Win XP PRO SP2. I want to install Vista ( Ultimate ) 32 bit Which drivers do I need & where can I get them ? Do I need new BIOS ? I am not a techy but Dell says that Vista will not work on this machine which is strange. Machine Specs are : Intel Pentium D 3.0 GHz Dual core Processor 2.0 GB DDR RAM 250 GB HDD 256 MB ATI Radion X600 Video Card capable of running two monitors Broadcom NetXtreme 57xx Gigabit Controller Conexant D860 56K V.9x DFVc Modem SoundMax Integrated Digital Audio NEC DVD+RW ND-3530A SONY DVD-ROM DDU1615 Please can someone give me a step by step as to how do I install the drivers too. Thank You in Advance.