Absolutely. During XP setup, you have an option to choose where to install the OS. Just choose to delete your existing partition, follow the instructions, and then create a partition in the empty space and install XP there. Please note that this will delete all of your files and settings unless you have them saved at a different place such as an external hard drive or another partition.
In Place
in-place upgrade
In-place upgrade
You just put in the installation disk for Win 7 and it will reinstall itself over the existing OS.
It could.
Arch Linux is intended for people who prefer to have more control over what they want installed on their system without going through a completely source-based installation process (as LFS or Gentoo are currently existing in).
W7 and W8 can be installed over each other or at the side of each other. By running the installation file or booting the DVD/USB. I'd like to recommend a format of your disk with w8 to get a cleaner installation process. Remember to take backup of your personal files! No matter what it tels you.
It is generally not a recommended procedure. The abrasion of carpet on carpet will cause both layers to wear prematurely. Certain types of glue down carpet can be installed over existing glue down carpet. Check the manufactures installation instructions. I do agree that installing stretch in carpet over existing stretch in carpet is not a good idea.
cupping - improper installation of shingles over existing shingles
If you have installed Windows software, you can learn from tutorials installed on your computer. Other resources are available all over the internet that will teach you the tips and tricks so you can operate Windows like a pro!
If you upgraded it should write over the existing Windows program (XP Pro). As you may know, XP pro takes over 1 gig of space. I am not sure on the amount of space that XP home edition takes up.
Floating Installation This method the floor floats over foam cushioned padding.