With more and more security risks arising in information system, research on the trusted computer architecture becomes a hot topic. Trusted Computing Group (TCG) has made deep research and given specifications of trusted computing platform. However, trusted computer is so different that many software of traditional systems can not run on it without any modification. What's more, users need some time to understand and be familiar with the new system. For these reasons, this paper suggests an alteration scenario for traditional universal computer based on user's USB-KEY, by which users can get almost the same degree of security protection in the generalpurpose system. The test result indicates that the universal trust-enhanced computers can assure to be used by authorized users, resist viruses and Trojans and maintain a secure and steady environment for above applications. This scenario costs very lowly, but can easily be put into practice.