Windows 7 Sound driver update!?!

[patriotaki]

hello im new here and im having problem with my speakers im using Logitech z506 5.1 but only 2-3 speakers are playing the rear ones make a strange sound? how can I fix this?
how can I update my driver I think its realtake

 

[Jimbo22]

Does your system have the capability to support 5.1 setup?