Well, I see a couple of things wrong here.
First, like I said, XP and Vista/7 have different bootloaders, so you're insisting on clinging to outdated information with regards to boot.ini. That only applies to NTLDR, which no longer exists in Vista/7. That's problem #1.
Problem #2, is like Bob said, you don't have the proper licenses to do this.
Problem #3, is that I'm seeing nothing that suggests you've even TRIED running some of these apps in 7, you just seem to assume they won't work. Probably 99% of apps that work in XP will work in 7 either without any special modifications or using the built-in compatibility modes MS introduced with XP SP2 and Win2K SP4.
Not so much a problem, maybe more informational, is that you can do the "Anytime Upgrade" to turn your 7 Home Premium into 7 Pro which offers XP Mode. It would be nice if MS offered an a la carte upgrade, so people could pick and choose which features they wanted to switch on. But you can at least pay the difference between Home Premium and Pro to get XP Mode. At the end of the day, it's probably going to be cheaper than going out and buying a non-upgrade license for 7. Maybe one of the Windows helper monkeys who frequent these forums can expand upon how it works with anytime updates if you should ever need to format. XP Mode is also likely far more convenient than rebooting. The performance hit from emulation is probably still going to work out to be less than the time you spend rebooting.
I think the whole XP Mode thing has backfired on MS. It seems to give people the mistaken idea that there is no backwards compatibility in 7 unless you have the XP Mode installed. When in reality, all XP Mode does is run a copy of XP in a virtual machine to give you compatibility with some apps that should have been phased out years ago, like Office97.
So, at the end of the day, you basically have three choices. You can try your apps with 7 to see if you even need anything more, you can buy a non-upgrade license for 7 and set up a dual boot, or do an anytime upgrade to 7 Pro and take advantage of XP Mode.