Microsoft has released an update to resolve reliability and application compatibility issues in Windows Vista. If you have received an Error Code 5 message, please go to the following link to download an update from Microsoft that will resolve this problem.

http://www.microsoft.com/downloads/details.aspx?FamilyId=46A30073-C3DF-473B-99E4-66380A5CC117&displaylang=en

Microsoft explains that "this update resolves reliability and application compatibility issues in Microsoft XML Core Service 4.0 Service Pack 2. By installing this update, you can achieve better reliability and application compatibility. After you install this item, you may have to restart your computer. Once you have installed this item, it cannot be removed."