Good Day Jyothi,
I appreciate your time getting back to this thread, it appears that there are multiple anti-virus installed, in your device , it shows McAfee and Avast , I highly suggest for you to uninstall one of them because it is not advisable to run multiple anti-virus at the same time it can cause conflicts with the two.
It shows that most of the Disk usage is from your System, scan you device using the free version of Malwarebytes scanner to check if there are malwares or adware running in your system.
Here's the link to download.
https://www.malwarebytes.com/mwb-download/thank...
Once downloaded and installed, open the app and perform a scan and check for malware infection.
After the scan restart your computer using cleanboot and observe the performance.
https://support.microsoft.com/en-us/topic/how-t...
Have a wonderful day ahead and stay safe.
Sincerely,
Carlo T.
Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.