|Click on Start, then Control Panel, then Programs and Features. It will be listed as OpenOfficeOrg and you will have the option to uninstall all of it or remove certain parts (use the 'change' option for this).|
You won't lose any of your existing documents as they are saved in your 'Documents' library.
Note that Word can open .odt documents but you may find the formatting changes slightly. This shouldn't be a problem if you always saved your documents as .doc files.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd