writing program to set a desktop background at startup

Hi, I am having problems with my 32 bit windows 7, it says my factory installed os is not genuine, and everytime I start my pc the background reverts to black color. I want to write a program which automatically chooses a desktop background at each startup. I do not know how to write programs but I guess this wont be difficult for you guys. It would be really helpful if you write the program. I would really appreciate it.
This forum isn't really about writing people's code for them. It's more of a learning and QA time place. We do have a job board if you really want someone to write a program for you. But chances are, nobody will do it for free. Most of us here work full time jobs and have families.
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