Database App Help

I've browsed through several threads re: database apps. There is quite a lot of conflicting information, seemingly dependent on what one would like the app to do. I thought maybe if I provided some details, someone would have a good suggestions.

As part of our business we sell a repair service for our products (various electronics). There is a fixed one-time cost for the service and it covers the products for two years. The customer gets two repairs per year under the contract.

Basically, I need an app where I can keep track of the customers that purchase this repair program. I need to be bale to search the database by name, phone number or the covered product. I also need to be able to keep track of how many repairs each customer has so that they do not exceed the two per year. Ideally, I would like to be able to run a report at the end of each month to determine the amount of money taken in from the sales of the contracts.

Finally, if I needed to view the database or reporting on a windows computer or share it with someone who doesn't have a mac, that would be ideal.

I don't think what I am trying to do is too complex, but I may be wrong, so if anyone can point me in the right direction, I would really appreciate it. It doesn't need to be fancy, just get the job done.

Thanks in advance for any suggestions!