First of all, don't start a new topic everytime you have a problem, stick to the first one. Second, what version of VC do you own? 1.0 or 1.1? If it happened when you first time started to play, try relaunching it again, after rebootingg your system. If it happens after you played for a while, remember that MTa VC is a beta software, and it has some bugs, so just close the error window, and get in game again.