how to fix error (-45048) i cant download any app from the app store

I have a problem with my iTunes. After i updates my iTunes to 11.1.3.8, i can't download apps or updates apps with my iTunes in pc. the notif always, "An unkown error occured (-45048). I use windows 7 Ultimate i try to uninstall the iTunes with using perfect uninstaller and then i install again. But nothing happen. Same problem. i dont know where is the problem.

can anybody help me to solve the problem?