Try this:

To Remove virtool:win32/delfinject.gen in you Computer First Use Manual steps to turn off on System Restore
Steps to turn off System Restore

1. Click Start, right-click My Computer, and then click Properties.
2. In the System Properties dialog box, click the System Restore tab.
3. Click to select the Turn off System Restore check box. Or, click to select the Turn off System Restore on all drives check box.
4. Click OK.
5. When you receive the following message, click Yes to confirm that you want to turn off System Restore.

Then After Restart you Computer Safe Mode with Networking How To Restart? To get into the Windows Safe Mode with Networking computer is booting press and hold your "F8 Key" which should bring up the "Windows Advanced Options Menu" as shown below. Use your arrow keys to move to Safe Mode with Networking and press your Enter key. Then Download Update and Scan Use Malwarebytes' Anti-Malware Press This Link [ Register or Signin to view external links. ]

Download and Scan by Use Super Anti-spyware Press here [ Register or Signin to view external links. ]

Download and Scan by Use Norman Malware Cleaner Press here [ Register or Signin to view external links. ]


After Finish Remove virtool:win32/delfinject.gen Restart You Computer To Be Normal Then After Turn On System Restore.Steps to turn on System Restore

1. Click Start, right-click My Computer, and then click Properties.
2. In the System Properties dialog box, click the System Restore tab.
3. Click to clear the Turn off System Restore check box. Or, click the Turn off System Restore on all drives check box.
4. Click OK.

After a few moments, the System Properties dialog box closes.
Restart you Computer to be Normal.