If you're experiencing issues during the installation of Windows, you can use System Restore to fix problems. Here's a step-by-step guide on how to do it:

Method 1: Using System Restore

• Check if your system is in Safe Mode: Before restoring your system, ensure that it's in Safe Mode. You can check by:

* Restarting your computer and pressing F8 during boot-up.

* Pressing Ctrl + Alt + Del to open the Start menu and selecting "System" > "Advanced system settings".

• Access System Restore: Go to Control Panel, then System and Security (or Settings in Windows 10), and click on System Protection.

• Click on System Properties and select "System Protection" from the left menu.

• Look for a list of restore points and click on any option that says "Restore this computer now".

• Choose the date and time you want to restore your system to, and then click "Next".

• Follow the prompts to complete the restoration process.

Method 2: Using System Restore from an External Device

If you don't have access to a USB drive or DVD with your Windows installation media, you can use an external device to restore your system:

• Connect an external USB drive or CD/DVD containing your Windows installation media.

• Restart your computer and enter Safe Mode by pressing F8 during boot-up.

• Go to Control Panel, then System and Security (or Settings in Windows 10), and click on Device Manager.

• Expand the "System" section and look for your external device in the list of devices.

• Right-click on it and select "Properties".

• Click on the "Restore with a USB drive or DVD" option and follow the prompts to complete the restoration process.

Method 3: Using System Restore from the Command Prompt

You can also use command line to restore your system:

• Press Win + R to open the Run dialog box.

• Type cmd and press Enter.

• Type systemrestore /savecd C:\Windows (or C:\Windows on a Windows 10 machine) and press Enter.

This will save your current system to a file, which can then be used to restore your system.

Method 4: Using a USB Drive with a Recovery Environment

If you have access to a USB drive or DVD containing a recovery environment (such as Windows 10's RE), you can use it to fix installation problems:

• Connect the USB drive or insert the DVD.

• Restart your computer and enter Safe Mode by pressing F8 during boot-up.

• Go to Control Panel, then System and Security (or Settings in Windows 10), and click on Device Manager.

• Expand the "System" section and look for your USB drive or CD/DVD in the list of devices.

• Right-click on it and select "Properties".

• Click on the "Repair with USB device" option and follow the prompts to complete the restoration process.

Remember to be careful when restoring your system, as you may need to overwrite existing files and data.