Microsoft Office Enterprise/etc

This program seems to have arrived with my win 7 Ultimate. Everytime I try to use my (very old MS Office) Office Enterprise tries to install itself. I'm not keen on a newer version, but I'd be prepared to let it install. Only....the install fails, saying it is missing EnterpriseWW.msi. I therefore cannot either complete the install, or uninstall.
Can someone help me before I go (even more) nuts.

Additional problem - I am logged in as an administrator, and want to delete a file called windows.old , which was left behind by a repair man who was fixing a hardware problem for me. It is taking up a lot of space, and it won't allow me to delete whatever I try.

There are times when I really hate was all so easy when I used to use DOS, Gem and the Amstrads....

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