Hi hajk, It could be a possibility that the Trend antivirus software was not completely uninstalled. We can use the uninstaller tools provided by the Trend antivirus software manufacturer to uninstall the software and then install Microsoft Security Essentials. Use the following link to download the uninstaller utility based on the version of Trend antivirus software installed on the computer: For Trend Micro Worry-Free Business Security Services: [URL] For Trend Micro Titanium Internet Security: [URL] After downloading the Uninstaller utility, run the file and follow the on-screen instructions to complete the uninstallation. Restart the computer and use the following link to download Microsoft Security Essentials: [URL] Please post the results.
I have a Dell Precision M4700 laptop which was delivered with Win 7 x64 Ultimate. It also had the bundled Trend AV software. When I try removing Trend, it seems to have issues but after some work rebooting, it seems to be be off the system. I then try to install MSE which appears to go okay and can even update and manage a scan. However, the first time I reboot after installation, the system hangs on the "Starting Windows" screen. I have reinstalled but unfortunately the saved Windows also includes the Trend s/w and it shows the same problem. I still have an older Latitude  D830 which I updated to to Win 7 x64 Ultimate. It runs MSE fine. It did not have the Trend preloaded and the drivers are a bit different due to differing hardware, Any ideas?
Taking Trend off an M4700 Win 7 laptop and putting Microsoft Security 
Essentials on results in a freeze during startup