Failed to root ICS 4.0.4

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http://androidforums.com – Hi... I am using Optima Smart, OPS-50...Android version 4.0.4. Dsb driver MT65xx preloder.. Build no- ALPS.ICS.MP.V2.16. I want to root my phone. I have tried many methods but failed. The main problem is adb push failed to copy su,busybox to system folder.error report "READ ONLY FILE SYSTEM". C:\Users\Sampad\Desktop\root>adb push su /system/xbin/ failed to copy 'su' to '/system/xbin//su': Read-only file system Plz hepl me to root my phone..:bawling: (General)