WHY DOES THE UPGRADE PROCESS FOR SOLIDWORKS HAVE TO BE SO DA(*$%)#(&%(*#& PAINFULL AND UNPREDICTABLE. It seems like every other service pack fails to install with one error or another error. If I was able to put service pack 4.0 on without an issue why does 4.1 fail with a 1603 installation error that it didn't have permission to write to a specific file or folder. It didn't have this problem when putting on SP 4.0 and no permissions changed on the system. And yes I turn off the virus & spyware protection when doing an SP install and also am logged on as the administrator.