.. it doesn't!
Long story short is that last week we bought a new office computer to replace an ageing Win7 machine. After initial setup, I installed Sage 50 Accounts which initially ran OK but on second run it crashed with a dll error on SGSchemeManager.dll. Google led me to hundreds of similar instances but no resolution. After wasting a couple of day, in desperation I did a full factory reset which HP claims removes *all* personal information and resets the computer to factory conditions
After going through the initial setup again, I installed Sage 50 Accounts once more and was mildly suspicious that this time I wasn't asked for a serial/key. After installation it crashed again straightaway.
I did another full factory reset choosing to wipe all drives completely. After the initial setup I searched the PC for SGSchemeManager.dll and it was still there (in C:/Windows/WinSXS). When I opened the file location there was a whole load of Sage files along with the problem one.
It seems to me that HP are deliberately telling lies.