Hi, I've recently upgraded to Vista 64, no hardware bother at all. The only thing that has sucked is that some of my older software doesn't work properly as it relies on dotnet framework 1 which Vista doesn't really like. Regardless of any bad press that Vista's had, I've had no problems getting hardware drivers and have had no bother with security. I have to say that I'd still be using 32bit XP Pro if my new main board was happy running 4Gig on a 32 bit system but it's not so I had to upgrade. I guess that I'm making the most of my system now, incidently....is there any point in having a 64 bit processor if you're running a 32Bit O/S? Mat.