I'm attempting to install XP onto a new 160GB, single partition HDD. Booting from the original CD, I have selected the new drive (the original, 30GB HDD is slaved) and ensured it wasn't ...
I was running Windows XP Pro x64 with SP2. Made a new partition, installed Windows 7 on new partition. On boot, I could pick Windows 7, or older Windows OS (XP Pro x64 SP2, basically Server 2003 SP2).