Hi,
I just wonder one thing with Windows update and a fresh install.
Say, I'm using Vista Ultimate and I always check for updates and update whenever the updates are available.
Now as we know, there's Vista service pack 1 or even 2 available, So do I need to buy a new vista with sp1 or sp2 disc, and then make a fresh install on my machine ? And what about my current vista that I always use windows update ? Is the system of update windows and install a fresh copy of vista integrated sp1 or sp2 the same ?

If this is not the same, then how can I install vista sp1 or sp2 over my old vista ? Or do I need to format my drive then install sp1 or sp2 again ?

I checked several days ago in Microsoft.com seeing Vista sp1 is available for download with around 400Mb. But I didn't download it, as I saw it says "If you're using only on one computer...then just use windows update...blah blah.."

Thanks, and wait for everyone's idea.