Vista 64 on my laptop??

So I am going to buy a new laptop and for the most part, especially the ones
I am interested in, my only option is MS Vista Home Premium 64bit. Now my
laptop purchase isn't meant to replace my desktop machines at all, but I am
purchasing it because I am going back to school and because from time to
time, it would be nice to do some things like messing with my music library
and pictures from the comfort of my couch. Anyhow, on the the 'concerns'.
With the 64bit being pretty much my option for my new laptop, I have some
concerns on software that I will want to use and install. Some I know won't
have an issue like Adobe CS4 and whatnot, but other items, I am wondering
how they will fare? Being that I have never used Vista for anything
production wise, I have not familiarized myself with what it can and cannot
do. Being that most programs out there are 32bit, what is one to do with
this 64bit operating system for as I understand, it doesn't have backward
compatability from 64 to 32. I believe this was for software and hardware.
Am I wrong? Am I stressing over this when in fact I should have no issues
whatsoever? My initial thoughts were to just downgrade the laptop to XP Pro,
but with laptops these days, it ain't as simple as it sounds since you have
to find "ALL" the drivers and what not if you want any of the original
functionality of the laptop. I know my way around computers pretty good and
plan on picking up this laptop tomorrow I hope. Going for the HP dv7-1245dx
from Best Buy. Anyhow, sorry for the long read and if some of you could
please take the time to ease my fears of issues with someware, especially
older stuff and it's functionality, I would much appreciate it.