Windows update says that it could not search for new updates and gives the error code 80070643. From what I have read it has something to do with Office 2003 and I dont even have it installed. I tried downloading and installing vista sp2 but it fails as well giving me error: ERROR_EVT_CONFIGURATION_ERROR(0x89973aa2). Can someone please help me resolve this issue?
Windows Update error 80070643 could also be a .NET framework problem... Follow the link gived by Chris (Windows Update error 80070643)
If that doesn't help, you could try Fix WU, this utility will re-register a total of 114 .dll, ocx and .ax files which are required for the proper functioning of Windows Updates.
You might want to read up on this article about the Windows Update error 80070643. If you were installing Microsoft Office 2003 updates when you received the error, follow the instructions in the "Microsoft Office 2003" section of the article. Otherwise, follow the instructions in the "Windows .NET Framework" section.
Good luck, and hope this helps some.