First thing I did was turn off User Account Control. Stops all of those irritating warnings.
I'll second that Smitty.
Once you turn off all the Security Crap, Vista is really quite nice.
For me, I only use it for some games, a little browsing and email.
I don't keep any personal information like SSN or CC #s on my PC. So I never really worry too much about security. I keep all my documents on an external drive.
But that's just me, so I turn all the security crap off.
In previous computers, I've always just let them run with little security. I get security from My Router where I Enable MAC ID Filtters, so only Select Mac IDs have access. So that prevents intentional hacking. If I'm dumb enough to go to a website that infects me with a virus or spyware, or my pc performance starts getting iffy, or whatever, I'll just reformat and start over. I actually enjoy the reformatting. So I normally end up reformatting like every six months or so. That's the extent of my troublehsooting and worry about security.
Now, I bought a New Dell Laptop with Vista Home Premium about a year ago. And this works for me to get it running very well.
Turn off User Account Control
In Services :
Disable Windows Firewall
Disable Defender
Disable the Security Center
PrePackaged Norton Internet Security and AV software, I leave installed, but disable all the automatic features, so it only runs when I tell it to.
That laptop has run EXCELLENT for me for over a year now. Normally by now on any other PC with previous OS, I would start having slower performance, just general bogging down and I would be reformatting it. But not with Vista, it is running GREAT.