If you install Windows 7 on a clean disk with no existing partitions, it creates a System Reserved partition at the beginning of the disk and uses the remainder of the unallocated space to create your system drive.
The playback controls at the bottom of the Windows Media Player window illustrate that universal advice for Windows enthusiasts: when in doubt, click and right-click.If you follow that advice, you’ll be amply rewarded.
Most existing 16-bit and MS-DOS-based programs were originally written for Windows 3.0 or Windows 3.1. Windows 7 runs these older programs using a virtual machine that mimics the 386-enhanced mode used by Windows 3.0 and Windows 3.1.
If you've old but important software that no longer runs under Windows 7, then you could try using XP Mode, a virtual copy of XP that runs in a window on your Windows 7 desktop.
Microsoft's Virtual PC creates its virtual machine hard drives in VHD files, and Windows 7 can now mount these directly so you can access them in the host system.
If you've downloaded Windows 7 (and even if you haven't) it's a good idea to create a system repair disc straight away in case you run into problems booting the OS later on. Click Start > Maintenance > Create a System Repair Disc, and let Windows 7 build a bootable emergency disc. If the worst does happen then it could be the only way to get your PC running again