TrojanDropper:Win32/Rovnix.I

The following free Microsoft software detects and removes this threat:

• Microsoft Security Essentials or, for Windows 8, Windows Defender
• Microsoft Safety Scanner

However, in some cases you may need to use the free tool Windows Defender Offline to fully clean your PC:

• Windows Defender Offline

The following articles may help if you're having trouble getting the tool to work:

• Windows Defender Offline: frequently asked questions
• Microsoft's Free Security Tools - Windows Defender Offline

After you've used Windows Defender Offline, you should make sure your security software is up to date and run a full scan:

• Get the latest updates 

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

You can also visit the Microsoft virus and malware community for more help.

Run the Bootrec.exe tool

To completely remove this threat you might need to run the Bootrec.exe tool using your Windows installation CD.

For Windows 8:

1. Put your Windows 8 media in the DVD drive and restart your PC.
2. Select a language, time and currency, and keyboard or input method, and then click Next.
3. Click Repair your computer.
4. Click Troubleshoot, then Advanced options.
5. Click Command Prompt and then type Bootrec /FixBoot and then presss Enter.
6. Type Exit and the press Enter.
7. At the Choose an Option screen click Continue.
8. Remove the Windows 8 CD from your DVD drive and restart your PC.

For Windows 7:

1. Put your Windows 7 media in the DVD drive and restart your PC
2. Press any key when you are prompted.
3. Select a language, time and currency, and keyboard or input method, and then click Next.
4. Click Repair your computer.
5. Select the operating system that you want to repair, and then click Next.
6. In the SystemRecovery Options dialog box, click Command Prompt.
7. Type Bootrec.exe /fixboot, and then press Enter.
8. Remove the Windows 7 CD from your DVD drive and restart your PC.