I am running Office Home and Student 2007 on Windows 7 Professional. I purchased and want to install Office Home and Student 2010. I get the error 2203 when trying to install. What is this error and how do I correct?
Microsoft Support has a solution page for you: Link
Cause: The default user temporary folder (%temp%) has insufficient permissions assigned to it.
If this resolution does not work for you, take a look at this thread on Microsoft Social Answers which exactly covers the same issue.