I ran the installer set for compatibility with Windows XP Service Pack 3, and it ran without giving me the error. I haven't tried installing the update on the EFIS/EMS yet.
I bought a new notebook with Windows 7 so I could update to 5.3. I get error code 0x8002801c :unable to register the type library-TypeLib failed. I removed Firefox and stopzilla, paused Avast on advice from tech support. Still the same. Any ideas?