1. If you have an antivirus program on your infected computer, you can run a full scan to find and remove the malicious program/software.
2. Once it is free from virus, restore the system to last recovery point.
1. Remove the hard disk.
2. Connect it externally to a laptop/ computer using a SATA cable.
3. Run the antivirus program on the device to which the infected harddisk is connected.
4. Take the backup.
Reset all file attributes to unhide files hidden by a virus:
Step 1: Install data recovery software.
Step 2: Scan the infected drive.
Step 3: Select files for recovery.
Step 4: Recover selected files to a safe location.
Step 5: Format the infected drive.