Tutorials of Fixing System Error 4120 Error

I cannot install any program on my computer since I download windows 10. I installed windows 10 several months ago, I'm not sure it has anything to do with my problem.  But I need usefull suggestions to repair System Error 4120 problem. Help please!

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At times, System Error 4120 error can be caused by the installation of a program. Once you uninstalled the software, System Error 4120 issues will be solved with ease. {Before uninstalling the program, do a clean boot for your PC is highly recommended!

Perform a clean boot on your own:

1. Log on to the computer by using an account that has administrator rights.

2. Click Start, type msconfig.exe in the Start Search box, and then press Enter to start the System Configuration utility.

Note: If you are prompted for an administrator password or for confirmation, you should type the password or provide confirmation.

3. On the General tab, click the Selective startup option, and then click to clear the Load startup items check box. (The Use Original Boot.ini check box is unavailable.)

4. On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.

Note This step lets Microsoft services continue to run. These services include Networking, Plug and Play, Event Logging, Error Reporting, and other services. If you disable these services, you may permanently delete all restore points. Do not do this if you want to use the System Restore utility together with existing restore points.

5. Click OK, and then click Restart.

Reference: http://support.microsoft.com/kb/929135/en-us

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