The win7 system removes unusable drive devices and quickly launches some locations in the

system or some outdated drivers, many people may not care. But these things are often a major cause of computer restart, and should be cleaned up in time.

1. Right click on the Win7 desktop & ldquo; Computer & rdquo;, select “ Properties & rdquo;. As shown in Figure 1
Figure 1 Right click on "Computer" properties

2, found in the left panel "advanced system settings", as shown in Figure 2
Figure 2 Advanced System Settings

3. Click the "Environment Variable" at the bottom of the “Advanced” tab. As shown in Figure 3, Figure 3 Environment Variables

4. In the upper part of the User Variables of XX, click on “New”. As shown in Figure 4

Enter the variable name: devmgr_show_nonpresent_devices

Enter the variable value: 1, and finally click the <;OK” button.
Figure 4 New User Variables

4. Right-click on the desktop & computer; "Computer”, select “Manage”, open “Device Manager on the left side. As shown in Figure 5, Figure 5 Device Manager

5. In the top menu bar of the Device Manager, select “View”——“Show hidden devices”. As shown in Figure 6
Figure 6 shows the hidden device

6. You can find "Other devices" on the right side of the device manager. Right-click "Unknown device", unload it! As shown in Figure 7,
Figure 7 Right-click "Unknown device", uninstall

This way you can avoid No one has anything to say, causing the computer to crash and restart what.