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.