Can I install Windows XP after opensuse 12.3 ?

Opensuse 12.3
KDE 4.10.5

Previously I had Windows XP and I.nstalled Opensuse 12.3 on top of it and Grub kept things straight.
Well, after a crash, I reinstalled openSuse 12.3 and had forgotten to install Windows 1st.

So, in an attempt to "fix" things, I installed VirtualBox and Windows XP within it.
That was not a good solution as XP is so painfully slow as to be not useable.

So, can I install XP on top of 12.3 and have Grub keep them straight ? IE so I have a dual boot box. .
Or am I going to have to start fresh, install XP 1st, then 12.3 ? I hope not.

thanks