Windows Vista is known for a lot of things. Among them is eating memory, both in storage and RAM, like a fat kid through cake. The folks who made VLite, a program designed to let you custom-build a Windows Vista disk without a lot of things you don't need, were very proud of what their program was doing for people who liked a streamlined operating system. Unfortunately for VLite, Microsoft has sent a look of scorn at the makers of the software. A public outcry asks, why? After all, VLite keeps people using Vista, instead of letting them come to the conclusion that XP is more streamlined, and should be used in place of Vista. However, Microsoft's reason for not liking VLite actually makes a lot of sense. When users go merrily chopping programs and processes willy-nilly, they risk keeping Windows Vista from updating properly in the future. Basically, Windows Update would try to update a component that isn't there, making parts of Windows unstable, and possibly bricking the whole system.

As long as you understand the risks, though, and know what you're doing, using VLite should not be a problem, and Microsoft is not going to make VLite copies of Vista illegal.