How can you get iTunes to recognize a PC as a PC (not an OS as a PC)?

Question

I have three PC's and all three are dual-boot. Of course each PC can only be running one Operating System (OS) at any one time - regardless of how many  may be available.
It is important to me to have my music (iTunes) available on each PC regardless of which OS I happen to be running. But I can't have my iTunes music on all three of my PCs with the 5 PC Authorization limit working incorrectly.
The limit of five PCs should work fine for me (since I have only three PCs) - except that iTunes erroneously considers an OS as a PC - not a PC as a PC.
So with three PCs each of which has (at least) two OSs iTunes does not allow me to authorize (and play my purchased music) on all three PCs - only two of them and sometimes on the third - depending on which OS I happen to use.
Another problem caused by counting an OS as a PC (instead of a PC as a PC) is that when an OS crashes and cannot be repaired - iTunes demands to Authorize it yet again before playing the (same) music.
When testrng a new OS reloads are sometimes required - even after running stable for some period - therefore it is easy to use up 3 of the 5 PC 'Authorizations' on one OS on one PC.
It would be so easy to fix these (manufactured) problems - just Authorize a PC as a PC - instead of an OS as a PC!
It should be easy to Authorize a PC as a PC by using a unique identifier such as the motherboard serial number as the PC ID. Although the MB may be changed that is far less likely than the constant upgrading and changing of the OS.
Right now I have an OS (Win 7) that will not start all the way. I fixed the Boot Record(s) and reloaded Boot Manager, but it stops after the first cursor and before the welcome screen. After spending a certain amount of time debugging and recovering all my data I would normally just re-write the drive, but I had already Authorized iTunes on it - just after using my (once yearly) clear of the five Auths. So I have to spend days and days trying to recover something I could rebuild in an hour - just because I need to save the iTunes Authorization. All the other software (including the OS and Office) will immediately re-Activate on the same PC. But not iTunes.
What is the work-around for this error of calling an OS a PC? and... How do I recover a previous Authorization on a PC when I have to rebuild an OS on that PC?

Answer 1

Hi turingtest2 - thanks for the reply. As you say It is how it is - and I have three workstations in this home (not counting three for my children and one for the family) and I pretty much always have more than one OS on each - that's how it is for me. I shouldn't have to worry about how many OSs I have (or how often I change them) just to have music while I'm working - through the PC sound system that is. I never have to worry about any other software, only iTunes. Once in a while (in the past) I've made a vendor call if I changed to many things to often (like CPU, GPU, memory, etc - or even a replacement MB) - but that hasn't happened in a couple years (at least since Vista) so I think (hope) they have fixed that for good. And even then it was a quick call and problem resolved. The only (glaring) constant problem is iTunes - limiting my own use of my own music (by counting an OS as a physical PC). Even with VM (which is just another OS) - although you can Attach things to multiple active OSs - it's still your own (purchased) music - and all on one PC. Thanks again!