Conversely, the PC I'm about to retire in the next two months or so has been going strong for over 4 years with Vista installed with no crashes, viruses, malware, or any other issues in all that time. Mostly because I waited to move from XP until after the first Service Pack was released, and also because I built the system myself and didn't install garbage components in it, which tends to be what you get in most moderately-priced store-bought PCs. On a high-end machine, it's much more difficult to notice Vista's resource hogging issues.
When the Ivy Bridge chipset is released in the next few months, I'll be building a new system around the Core i7 3770K. I've been putting off upgrading to 7 until then, as Vista still seems quite serviceable on this machine.
But on a system as old as the one being discussed here, as I mentioned in my first reply, upgraded RAM won't really be enough to prevent a very large performance drop-off with Vitsa.
Edited by TM2-Megatron, 01 March 2012 - 07:25 AM.