If you haven't got a shortcut on your desktop - click on Start, All programs, Open Office (folder) and select which program you need from the list.
Just open it as if it was an OpenOffice document. OpenOffice will read MS Works documents quite happily, and you can either save them as OpenOffice or MS Works formats.
Yes it is.
No - OpenOffice does not require registration of any kind.
People like the software because it's 'open source' - meaning anyone can make changes to it as they see fit (unlike MS Office which is copyright by Microsoft). OpenOffice is perfectly safe to use.
OpenOffice or LibreOffice can open PowerPoint presentations.
If you mean can you write something using Microsoft Works word-processor - and open it using OpenOffice - yes you can ! OpenOffice will happily open .wks files.
No reason why not - providing the document was saved in a format OpenOffice can read. Windows 7 is the operating system - OpenOffice is a program.
Short answer - No. Long answer - they are one of the partners who helped develop the OpenOffice software. OpenOffice is not owned by any single company. It is 'open source' meaning it is 'owned' by the community of end-users.
Only you know which operating system your version of OpenOffice is installed on. The version of OpenOffice you're using, can be found by - opening any document, clicking the 'help' button, and selecting the 'About OpenOffice' option.
OpenOffice doesn't usually autosave a file. It's down to the user to save their work periodically.
It's the law about open and avaible information.
Use (or install) OpenOffice.