I recommend you UnHackMe - Ultimate Malware Killer for fast malware removal:
Free Download Fully Functional 30-day Trial. No credit card is required.
Reviews. EULA. Privacy Policy. Uninstall.
The file yahoodc.exe is malware related.
You must delete the file yahoodc.exe immediately!
Kill the process yahoodc.exe and remove yahoodc.exe from Windows startup.