lost my windows office in error ..would like to have it back?

Firstly which is it you have lost is it windows or office, they are two different products. Windows is your operating system (such as XP or Vista), Office would be version 2000, 2003 or 2007. With regards to either of these it all depends on which version you had to start with. If it is an OEM version then you will need the original disc and key. If a business type version as long as you have the key you could potential use a disc from anyone else, as it is your key which denotes the licensing.

If you can't do this then there are alternatives out there, instead of Office try OpenOffice go to http://openoffice.org/ (ITS FREE)

Run a system restore - Restore your computer to a time before you lost your program. If you can't get it back, download open office ( http://www.openoffice.org/ ) it's a lot like Windows Office, but it's free. You can save files in .DOC format, so it can be opened by other Word programs.

restore your computer back to early date when u haven't lost it