Access database redesign

We have an existing database that is a combination of a CRM database and product database. Each product has a serial number and is linked too a certain customer. Through time there can be several consecutive owners, and we keep track of owner history, repair history and all initial data and registrations of the product when it is first produced. Each product is delivered with other serialized accessories, this is also registered. The database is build in Microsoft Access, and with increasing number of records entered over the last 10 years, it has become impractically slow. We therefore need it to be redesigned, using basically the same front end design on a more efficient database platform, probably SQL.