I suspect that you upgraded your installation (and will have to reinstall XP to get back to the way it was if you decide to remove Vista). The "route" is which option that you picked early on in the installation process. There were 2 choices - Upgrade or Custom. If you picked the Upgrade it will replace your XP system files with Vista system files. If you picked Custom, then it would let you change things like which drive you installed it on. On my system I installed it on another partition on a separate hard drive - that way I can keep my XP and run Vista.
I've been working with Vista for quite a while now (at least 12 different "builds" of it). Vista is good, there's no doubt in my mind about that - but there's really no overpowering need to go out and get it right away.
And, there are drawbacks to it that many are complaining about. These mainly revolve around the increased security, the automatic reporting to Microsoft, and the anti-piracy measures. These don't affect me as much as most users because:
1) I can circumvent the security if I need to
2) I select what leaves my computer and what doesn't
3) I am firmly committed to being "legal" with my software and haven't had any significant problems since I started being "legal".
4) I need Vista because I'm committed to providing assistance on forums like these. With Vista coming out soon, people will need help with it - and I hope to be in a position to offer that help.
So, if you've just gotta have the new technology - go for it! But if you're concerned about other things - then it won't hurt to wait. Remember the issues with SP2 for XP? Can we expect something similar for Vista?
I've got an older friend whose daughter keeps insisting that he upgrade to XP (from 98) - because "it's better". I went to his house and looked at his system, then we talked about what he does with his computer.
He checks his email at his dialup ISP, and surfs to exactly 3 websites. He only sends text emails and doesn't want to add anything special to what he does on the computer. His only concern was that his Win98 installation has "slowed down a bit" in the years that he's had it.
So, I did a few performance tweaks on it, gave him a few additional security programs (free of course) and he's been happy with this for the last year or so.