I have problems installing and uninstalling software in Windows 8.1 Pro Preview 64bit, Build 9431.
Problems started after a graphics driver update last night (NVidia Win8 64bit driver 326.80 for GeForce 630GT). After a reboot I couldn't install or uninstall anything anymore. When I start any setup program, it shows up in the task manager but remains idle. Starting another setup program fails until I kill the previous one. Uninstalling software via the programs and features menu won't work either. The Windows Installer Service is listed as stopped, however starting it manually won't help.
I also tried using compability mode for win 7 and starting setup programs as admin.
Thanks for your help.