You can only partition a drive once the formatted partitions are deleted, and there's raw drive space available. Windows 7 and Vista both offer a nifty feature whereby you can re-partition a hard drive so long as it has free space towards the end of the partition. Make sure you defrag before you do this, as random files in sectors at the end of the drive mess up the amount of space you would have been given.
Near as I can tell, installing over Windows is fine, but getting it off might be a bit iffy. I've never tried, as I've always dual-booted or run Linux in a virtual machine. Windows performance is unaffected, but Linux does drop a slight bit.
Command-line parameters are available in the documentation for each distro, but really one needs to find the commands for the kernel that the distro is based on; e.g. Ubuntu is based on Debian, Fedora is based on Red Hat.
This is a start. Its not comprehensive, but its better than taking a 3-month course to effectively learn nothing but how to best alienate yourself from OSS. The
Ubuntu server guide is also quite useful, if a bit limited.
I'd actually go as far to say that Ubuntu is the one distro that requires the least terminal commands, especially the absolutely perfect 10.4 LTS edition. Linux Mint follows in second place for being the easiest to use out of the box.
Also, on the subject of emulators. I use
Virtual PC 2007 at work and at home. It creates a gigantic file on your PC thats only used by Virtual PC, and that's what the OS running under VPC uses as storage space. You can configure it to any size you want. Getting Linux, any version of Linux, onto a virtual PC is quite cumbersome, but doable. At the end of the day, you basically have another PC on your network. Only its not as functional, or as fast. And not as easy to use, either.
Crappy picture here, but its a good example:
Picture related