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Realtek HD Audio Manager missing from Device Manager & Advanced Tab missing from


I have a HP Pavilion dv6707us Entertainment Notebook PC. I was using Home Premium 32 bit Vista but I did a clean installation with Home Premium 64 Vista. I downloaded and installed all the drivers from HP’s site for 64 Vista. After clean installation I am facing the following problems.
1.   Realtek HD Audio Manager is missing from Device Manager.
2.   Advanced tab is missing from BIOS.
3.   CD/DVD drive is not reading media.
    Installed the latest Realtek driver. Its showing in control panel. But not showing in device manager. When I checked in Device Manager sound, video and game controllers only conexant audio is there realtek is missing from there.
    Now I am unable to use my external mic and internal mic volume is very low.
   Looked into few forums there I found I need to enable my on board audio in BIOS but when I checked into my BIOS there is no ADVANCED TAB .
My system details are :-
Operating System   :    Windows  Vista Home Premium SP 1 64bit
Ram         :    2 GB RAM
Graphics      :   Nvidia GeForce Go 7150
System Model       :    MCP67
System Type       :    x64 Based PC
Processor       :    AMD Athlon 64 X2 TK-57 dual-core processor 1.90GH
BIOS Version      :    F.32
SMBIOS Version   :    2.4

Please please please helpppppppppppp meeeeee….