Hello, I'm extremely sorry for not replying sooner to your report, but I have not been at a computer recently. Anyhow, this error is basically caused by the following reason:
Your computer has a anti-virus software running that detects the client's files as a virus, which are obviously not. The main way to avoid this problem, is to add the clients folder to the exception list on your anti virus. If you are unsure on how to do this, then simply disable it. If you would like me to check into the problem for you, simply install Team Viewer, and PM me the ID/Pass when I am online, and hopefully I will be able to assist you at that time. Do not post your Team Viewer information here like others have. Your computer could be compromised if you do so. You will also need to re-install the client when you are done doing this.
The error could also be happening from other bugs in the installation. If after doing the above stated, and it still doesn't launch, then try re-installing the client completely.
Anyway, have a wonderful day.
~RedEyes.