text: how can i install and uninstall an operating system from a computer?   yes & no  depends on how you want to install & uninstall the operating system (os)...  two things need to be explained before answering such a question... - what is the os; - how is it installed/how dod you intend to install...  if the os is a windows upgrade, then yes, you can uninstall it and return to your pewviously installed os  if its a fresh copy of any os - and is the solo os on the pc, then its not called uninstall, but format, to wipe out the partition...  if you have two os on one partition with a boot manager, then, depending on the os planning to move, you will format the partition of the os that you intend to remove (if its on a different partition from the other os)...also, you will have to remove it from the boot manager, so you don't get the boot selection screen everytime your pc starts...  on the other hand, if you are using virtualpc or vmware, which simply enables you to install an os as a program under your default os, then you simply delete teh virtual hard disk you create, and that is basically it... installing on virtual machines is just like normal installations, but run as a program on your os...  hope that answers your question...