General :: Installing Win7 On Machine Running Ubuntu ?

I've assembled a new computer to replace a dead Xp/Debian dual boot machine. I have been persuaded to go for Ubuntu as a Linux-only box, running Win7 as a virtual machine. I had some help setting it up with two discs in a Raid1 array, and it works pretty well. One of those discs is, I notice, set up as bootable.

But.... it is causing a major headache in respect of USB when emulating windows. I cannot use devices such as my USB printer at present, and I have an urgent task which requires printing capability and Windows. I have spent time trying to sort the USB problem without success and have decided to take an alternative route for the present.

I have purchased two extra discs which are not included in the Raid array, with the intention of using one of them for a Win7 installation, making the machine dual-boot for now. Eventually the intention is to revert to Linux only with a 4-disc Raid.

And don't know how to proceed. I formatted one of the new discs to NTFS using Ubuntu's Disc Utility, and tried to install Win7 on that disc. I get a warning that Windows cannot find a suitable disc on which to install. I've tried with XP as well, and this copies all its files before proudly announcing that there is no suitable disc space on this machine. Two new 1Tb discs and no space!