Video card type, make, model, chip set and amount of onboard ram. Monitor resolutions, color depth, horizontal frequency range, vertical frequency, and interlaced or non-interlaced. SCSI adapter and devices, if any. Sound card type, make and model. Ethernet card type, make, model, chip set, IRQ, and bus base address.
Phone modem make, model, speed.
Your hostname, domain name and nameserver IP addresses. Your IP address, if it's statically assigned. While you're still running Windows, make sure you can connect to your ISP or your favorite internet site. If you're starting out with a single drive system, chances are Windows is living in a single partition spanning the entire disk. This is gonna change.