Go to 'Start', then click on 'Windows Tools':
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In the 'Control Panel' window, double-click on 'Disk Cleanup:
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In the 'Disk Cleanup' pop-up window - if the 'Disk Cleanup : Drive' selection window appears, select the drive where your OS is installed - click on 'OK' and then click on the 'Clean up system files' button:
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Click on 'OK' to confirm your drive selection:
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It will scan your drive, and then this window will appear:
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Click on 'OK':
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Click on the 'Delete Files' button:
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When it has completed the 'Disk Cleanup', the pop-up will disappear & you can now close the 'Control Panel' window.
Then do a system reboot & log back in again.
This procedure should clean up all unnecessary clutter on your system & hopefully improve its performance as well.