I've attempted to install a couple new applications (Adobe Acrobat and IMSI TurboCad 17.1) recently and in each case received a 1935 error, causing the installation to terminate and roll back. I have done a registry scan/clean as well as virus/spyware scans and the problem persists. I have run the installations under Administrator and disabled my virus checker, also with no success. I am using Win7 Professional 6.1 with all service packs and updates current. Help!