The website "www.videodownloadconverter.com" has a toolbar called VideoDownloadConverter that contains Potentially Unwanted Programs (PUPs). Potentially Unwanted Programs are applications that contain adwares, toolbars or web browser hijackers. These programs tend to be difficullt to remove after they have been installed on your computer.
The VideoDownloadConverter Website and Toolbar

The VideoDownloadConverter toolbar installation file was scanned at virustotal.com and 6 out of 46 antivirus software detected a threat.
The following threats were found:
File name: VideoDownloadConvertSetup2.5.12.0.exe
Detection: 6 / 46
Analysis date: 2013-04-13
- Win32:FunWeb-J [PUP]
- Zango
- Win32/AdInstaller
- Adware.MyWebSearch-15
- WebToolbar.Win32.MyWebSearch.gen
- MyWebSearch.J (v) (not malicious)
If you have already installed this toolbar, click here to use AdwCleaner to remove the Potentially Unwanted Programs that were installed.. AdwCleaner is a very small program and doesn't require any installation.
I do not recommend installing the VideoDownloadConverter toolbar.