Vista removed, XP put on. Now my PC won't work!
Hello there. This is true yes, some computer components require Windows Vista and its drivers to support the device. As XP is not working for you, you would need to re-install Vista from the installation DVD, many companies do not provide a DVD but instead provide their own software, this sometimes comes on disc but also can be a bootup option when you turn on your computer.
Really you need to get in contact with whoever you purchased the computer from, as your Vista was paid for and licensed to _you_
They will either be able to instruct you how to get Vista back on, or provide you with the necessary disc.
Hope this helps.