Ubuntu on external hard drive | graphic drivers problem

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http://askubuntu.com – First of all :i'm a unfamiliar when it comes to ubuntu or any other linux distros.. Question backround: I installed ubuntu 12.10 on my external hard drive. (Desktop PC) Installed closed amd drives because default ones freeze "desktop" view. Now i plugged external hard drive on my laptop and it says that there is a problem with graphic drivers. Laptop graphic card= Nvidia GT 555m, Desktop PC graphic gard = AMD Radeon HD 6950 Question: Is there some way that i don't have to reinstall graphic drivers everytime when i plug hard drive into different machine. "Just Select it." (HowTos)