How to Start your pc in safe mode for all windows (windows 7,8,8.1)

1. Press window + R from your keybord

2. Then you show Run window like this below

Type '' msconfig ''  and press OK


3. Now you show a window look like this below 

- Select Boot menu
- Tick on Safe mode
- Click on apply
- OK

4. Now your pc restart in safe mode always

For normal boot again do same process in safe mode

and uncheck the box of safe mode

Click on apply then Ok....

Now your pc restart  normally   thanks