We use both Computer side and user side installs via GPO. Seeing recently where both are re-installing at every reboot or login, rather than recognizing the software is already installed. Not occuring with every install, but most. Each GPO is configured exactly the same way, just pointing to different .msi installs. Server 2008 SR2; occuring on both WinXP Pro SP3 systems and Windows 7 Enterprise SP1.