I have an interesting situation where there is no USB or CD/DVD or option to add one. There is only 1 available SATA port on the motherboard in use for the 1 single 1 TB drive. The goal is to partition the hard drive (already done) and start the installation withing the current version of Windows, without upgrading the current version and force it to install on the other partition so that it will dual-boot. The problem though is it seems to always want to upgrade (Windows 7). Is there a way to start the install within the current version of Windows and tell it to install on the other partition (keeping in mind that this must be done via the hard drive only as there is no USB or CD option)?