2. win 7 has been FAR more stable for me - NO random BSODs - and better performance overall than xp 32bit on the same pc.
3. compatibility actually tends to move forward in time - not backward. i can use Cubase 6.5 and REAPER 4 x64 here in Win 7 x64 Ultimate. can we say that of xp?
3. the only apps i have that won't work are crap anyway and there are clear reasons why their authors didn't make a small update for them.
4. i hate samplers that need proprietary things to work - 16bit is an unreasonable mode to work in - perhaps you need a more proper workaround such as a linux virtual machine if you need to keep that ancient sampler?
i would be very worried in this day and age using an OS that is 11 years old next friday.. if i had complaints who am i going to call? the ghostbusters?