In other words, how many megs or gigs? Just curious...
My Windows 7 is 26GB on a 40GB partition.
An install DVD gets expanded when installed,
which is why more space would be involved.
Another way to estimate, is to download a VM from
modern.ie and open the downloaded files in 7ZIP.
The four IE10.Win7.For.WindowsVPC.part01.exe type
files I have here, when examined with 7ZIP, the size
shown for C: is 10,530,535,936 or let's call it
10.5GB. But you should allow some room for growth,
and space for System Volume Information to work
properly.
http://www.modern.ie/en-us/virtualization-tools#downloads
A WinXP user, could install a copy of VPC2007,
download IE10.Win7.For.WindowsVPC.part01.exe
and the three other files, and end up with a
working copy of Windows 7 (unactivated). It
will run for a while, before you have to unpack
another copy. It's possible that one, 7ZIP was not
successful at unpacking the RAR, and the .exe actually
had to be run itself, to work. VPC2007 is not
the same thing as Windows Virtual PC, and some
of the integration features will be broken if
run that way. But that's the setup I use, when
answering questions about Windows 7, from the
comfort of my WinXP machine. Otherwise, I have
to boot up my Windows 7 laptop.
To run VMs, you should have a decent amount
of RAM in the computer. If you're serious, you'd
have at least 3GB of RAM on WinXP 32 bit, to
give some "elbow room". That way, you can be
running a VM or two, take screenshots, write
posts etc, without running out of RAM.
Paul