Hi,
Please verify if the files and applications are still present. Also check the Recycle Bin to ensure that important files haven't been accidentally deleted and moved to the Recycle Bin.
If the files are missing, run CHKDSK to check for disk errors. Open Command Prompt as an administrator, type chkdsk C: /f /r
and press Enter. Follow the prompts to schedule a scan on the next restart.
If chkdsk found no errors on your disk, then the files could be deleted. You can reinstall the applications or try some third-party data recovery tools to recover your data. Do not continue writing to disk to avoid overwriting the original data.