What if the win7 computer can't install some software?

In fact, before, when I went to the win7 system to download, there were friends who said that they encountered such problems. For example, in the Vista system, this problem still exists. Although the Win7 system is upgraded, Microsoft has already solved this problem. The fix was made, but it seems that the fix is ​​not very good. So what is the problem? When installing a lot of software on the computer, it is said: Can not access the Windows Installer service, as shown in the following figure. So what should I do when I encounter such a problem? I can't say that I can't install the software that I can't install! The following small series will introduce you to everyone, how to solve this problem!
1. Press the win+r key combination, or click the Start menu, find the command prompt in the attachment and click Enter, which will open the Run Command window.

2. Next, we enter the code in the run command window: reg delete HKLMSOFTWAREMicrosoftSQMClientWindowsDisabledSessions /va /f, and then click Enter.

3. After the computer has finished running, let's restart the computer. The above mentioned problem of not being able to access the Windows Installer service is solved.