System restore enables you to revert your computer to a prior state when it functioned correctly, should an irreversible issue occur with your system. Deleting system restore files may be necessary to reclaim disk space on your drive. Below are steps to delete old system files and disable system restore on your system.
Steps
Erase All Outdated System Restore Files, Except the Most Recent

Access the main menu by selecting 'Start.' Hover over 'All Programs,' then navigate to 'Accessories' and finally to 'System Tools.' Click on the program named 'Disk Cleanup.'

Select the '(C:)' drive from the drop-down menu and click 'OK.'

Once Disk Cleanup finishes its task, go to the 'More Options' tab. Under 'System Restore,' click the 'Clean up' button.

Click 'Yes' in the dialogue box to remove all old system restore files, except the most recent one.
Remove All System Restore Files and Disable System Restore in Windows XP

Access the main menu by clicking 'Start,' right-click on My Computer, then select 'Properties.'

Under the 'System Restore' heading, tick the box next to 'Turn off System Restore' and click 'OK.'
Delete All System Restore Files and Disable System Restore in Windows Vista

Click 'Start,' right-click on Computer, then select 'Properties.' from the menu.

Navigate to the 'System protection' link on the left side of the window.

Remove the checkmark next to your drive by clicking on it, then click the 'Turn System Restore Off' button.
Delete All System Restore Files and Disable System Restore in Windows 7

Click 'Start,' right-click on Computer, then select 'Properties.' from the menu.

Navigate to the 'System protection' link on the left side of the window.

Click on the 'Configure' button, then choose 'Turn off system protection' and click 'Apply.'
Delete All System Restore Files and Disable System Restore in Windows 10

Access the Start menu by clicking on 'Start' or pressing the Windows Key on your keyboard. Then, type 'System' and press Enter to open System in Control Panel.

Click on the System protection link in the left pane. A new window will open. Select your system drive, usually labeled as 'C:' drive, which should have protection enabled.

Click or tap on the 'Configure' button. In the new window that appears, click or tap the 'Delete' button located at the bottom right to delete all restore points.

Choose 'Disable system protection' and click Apply. Confirm by clicking yes in the confirmation dialog to turn it off.
Tips
Before performing any of these tasks, consider backing up your important files to avoid losing any valuable documents.
Warnings
- Some programs on your system may become unresponsive, malfunction, or stop working. Ensure you understand the consequences before disabling system restore on your computer.
- Disabling System Restore is not recommended as it will delete all restore points, preventing you from returning your system to an earlier working state.
