Error code-3412

about 3 weeks ago my laptop had a virus called antivirus360. I removed it with anti malware but ever since i can not open my istore. when i try to use itunes it does not recognise my music library and wont open istore due to error code-3412.does anyone know how i can solve this problem?,error-code-0x80070002-in-win-xp.html,error-code-0x80070002-in-win-xp.html