I run Vista 64 bit with 8G of ram.... I was nervous about this S/W when I bought my machine but it IS so reliable, better than any Mac system I've had or any PC stuff, even better than windows 2000.
Anyway, version 2.2 was solid for me and therefore a dream to use, it made me more money.
I often use a Mamiya ZD back and 2.2 opened the files with a green/yellow cast, not a problem but you don't need extra items in your workflow.
bottom line Lightroom 2.3 solved this and the colours are spot on...
Thanks Adobe for listening...again