Don't want to be stopped by such "Error deleting file: . GetLastError: ." error message while you are trying to use your program next time. Luckily, the methods to repair the Windows Installer Error 1601 issue shouldn't prove to be difficult to execute and you can try all them one by one. If the Windows Installer Error 1601 problem still can't be fixed by manual methods, you can scan and repair the issues by using the automatic repair tool below.
1.First of all click the Start button to view the Start Menu. Then choose the Control Panel option.
2.After click Control Panel, enter into System and Security, then click into Windows Update.
3. Now you are at the Windows Update section of our Window 7 Control panel. You can manually look up for any new updates by clicking the Check for updates button
Process Explorer is a system tool from Microsoft and works on Windows 7, an advanced tool which can show processes name, program data, description, image, processer name, etc. Have a try with Process Explorer; for example, use it to kill a program process.
1.Download Process Explorer.
2.Open process explorer, the main window looks like below, there are 2 parts, left side is processes list, and the details are listed on right side.
3.You can check system information by clicking View > System Information.
4.You can kill process by right click on related process name, select Kill Process.