The spawn points move after you die with windows 8 after you upgrade your system. This is documented into a video but it is not ready for release. Could mojang team please add /setspawn or /sethome to prevent players from losing their home after they die?

I had to delete all of my files and saved my world with a portable hard drive and then put the world back on the harddrive after I installed windows 8. I have no freaking idea where my home is now and totally lost in the game because this is not where I spawned originally.