Windows 7: Download Manager can't download any application file

any idea ?..
My Free Download Manager can't download any EXE file. Every i clicked download the status always showed message that "*.exe - Stopped"

1. Download MalwareBytes. Malwarebytes
2. Disconnect from the Internet.
3. Disable your present antivirus software.
4. Remove your present antivirus software.
5. Install and run the MalwareBytes Quick Scan (remove any bad guys)
6. Reconnect to Internet.
7. Update MalwareBytes.
8. Run malwarebytes quick scan again.(remove any bad guys)
9. Download and Install Microsoft Security Essentials.
http://www.microsoft.com/security_essentials/

Now I advise you disable MalwareBytes and only enable again when and if you need it..