Unbinding a ghost and why simsbot looks like a person all of a sudden

I have all the newest versions, expansion packs, and updates on my Sims3. My Sim purchased a simbot with her points and all of a sudden my simbot looks human, but still acts like a robot--is that normal.

The main problems is that my Sim the purchased the thing that is supposed to make gold. When I clicked on it, it wouldn't let me make gold but instead would let me bind a ghost. I thought I would try it and see what would happen. Now there is a ghost in my household that has all my sims things and my sim looks like the ghost on the little pictures. How can I get rid of the ghost without losing anything from my inventory?

I have one more question. My sim son has an ivisiable friend. We sent the rainbow gem to the science facility and they said if he brought 4000 simoleons then he could get the formula to turn the invisiable friend real. The star is there by the science facility, but I can't get it to give me the formula. It won't come up. I tried everything. Adding more money, giving the boy gold, gems, coins, and bags of money. Nothing works. How can I get it?

Thanks,

Debbie Turner