The type of error you are describing normally occurs due to an issue with the download (something gets corrupted during the download). The solution is to:
1. Uninstall Tube Toolbox using Windows Control Panel
2. Delete everything in the C:\Program Files\Sincell\Tube Toolbox folder or C:\Program Files (x86)\Sincell\Tube Toolbox (if you have a 64 bit computer)
3. Download the software again -
www.tubetoolbox.com/download.aspx4. Re-Install
This does not affect any data you may have.