HP ProBook 4545s Notebook PC - AMD Dual-Core A6-4400M 2.7GHz, 8GB DDR3, 750GB HDD, DVDRW, AMD Radeon HD 7520G, 15.6" Display, Windows 7 Pro 64-bit Currently has a Microsoft provided driver, version 6.1.7600.16385, vintage date 6/21/2006. I wasn't able to find the driver at AMD.
More about :latest driver amd dual core gig 4400m apu radeon 7520g graphics
Download the verification tool and run it. If your notebook can use the universal AMD drivers, then it will let you download it.
IF not, then the only place to get it is from HP and if there is no updates, then your either out of luck or have to wait until HP release new drivers.