What to do when operating system is not working properly?

We use  computers in our daily life many ways. Sometimes there may be something wrong when we are in a hurry while using computer.Such as Some cases we delete a file from  C drive accidentally  that is useful for operating system or we uninstall any software that is useful for operating system, then the computer will not work properly a error message will shown like “files missing”. Now are you tensed about how to get your operating system working properly??
No more waiting I will now show you the tricks about Operating System troubleshoot.
In order to solve this type of problem now remember the earlier date when your operating system was  alright . The date need not to be accurate just estimate.

For doing this you have to open  C: \ WINDOWS \ System32 \ Restore then double click on  rstrui.exe , then a new window will appear on the new window,  now  select Restore my computer to an earlier time click on next . Now you will see a calender . Now select the date (on which date your computer was okay)> click on next.

A new window will appear then click next button  again. After the Auto Restart the computer there will appear a  success messages.