Click Start > right click Computer > click Properties > look under Windows
Edition. No Service Pack has been released to the general public for Windows
Vista yet. Windows Vista SP1 which is currently in testing will be released
sometime in early 2008.
For Office 2007 applications such as Word, Excel, and PowerPoint, click the
Office Button > click Word Options > Resources > and look under 'about
Microsoft Office Word 2007'
If you are running a previous version of Microsoft Office, simply click Help
About Microsoft Word and you will see the indication whether its SP1, SP2
or SP3.