The are several reasons why vista churned so badly at startup was the indexing service and the service that was trying to load everything into memory. Turn those 2 off and vista worked as good as 7, I did this to dozens of computers and the owners were so happy. Several other background services needed about 1.5GB of memory just to get the system up and running. This was when 4GB of machine was considered 'huge'. By the time 7 came out they had fixed both of those services and a 'crappy' machine had 4GB. Dumping it on a box that 512MB of memory and it struggled badly (512-1024 was the sweet spot for XP). 8GB for Vista and up and for proper use of that, you need the 64bit ver.