Cant install REALTEK DRIVERS

i installed a new gfx card (nvidia gts 450). After i did so my realtek hd audio seemed to have disappeared from my computer. when i go to "sound" under control panel all i see is my usb headset. so i tried to install realtek hd audio drivers from realtek's site. the setup went smoothly but after i had restarted there were no signs of it. it wasnt in device manager. it was also not in my sound, playback devices.
so i went into control panel--> add hardware --> realtek hd audio. it blue screens halfway through the process, and now under device manager "realtek hd audio is shown with the yellow triangle and exclamation mark. i tried to update driver through this but it says "Code 10" could not install. it's weird that HD audio realtek is under programs installed, but it hasnt actually installed the sound card??
HELP PLEASE!!!
 

My Computer

System One

  • Manufacturer/Model
    Hp Pavilion a1730n
    CPU
    4600+ AMD Athlon 64 X2 Dual Core Processor
    Memory
    2048MB
    Graphics Card(s)
    Nvidia GeForce 6150 LE

My Computer

System One

  • Manufacturer/Model
    Hewlett-Packard SR5019UK
    CPU
    AMD Athlon 64 processor 3800 + 2.40GHz
    Motherboard
    M2N68-LA (Narra)
    Memory
    2.50GB
    Graphics Card(s)
    nVidia GeForce
    Sound Card
    Realtec ALC888 Audio
    Monitor(s) Displays
    17" LCD Monitor
    Hard Drives
    160 Gb Usable Hard Drive
    Other Info
    HP G56 Laptop Win 7 64bit. 4Gb Ram DDR2's. Hitachi 450Gb Hard Drive. Pentium(R) Duel-Core CPU.
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