Do I install the qnx and windows xp in a HD?

If I have only a HD. but I want to install QNX and windows XP.
How do I install QNX and windows xp in a HD?

it’s not a good idea to install qnx in host pc. try vmware/virtual pc . i’m using virtual pc 2004 in windows host and it works well

Yes you can
Install XP first, QNX correctly set boot loader with 1-XP and 2-QNX
good luck