Hi,
Ok, if Recovery Manager isn't working, try the following.
First, if you haven't already done so, go through the procedure below.
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Open windows Control Panel, open Programs and Features, right click the entry IDT Audio and select Uninstall.
When this has completed, restart the notebook.
Windows will load an audio driver automatically - just let this complete.
Click the Start Menu, open All Programs, open Accessories, right click the Command Prompt and select 'Run as Administrator'. In to the prompt type the following command and hit enter.
sfc /scannow ( note that there is a space between sfc and the / )
Let the process complete, then type exit and hit enter.
Restart the notebook again.
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Download the IDT Audio installer again on the link below and save it to your Downloads folder.
http://ftp.hp.com/pub/softpaq/sp55001-55500/sp55094.exe
Next, if you don't have an extraction utility installed, download and install 7-Zip. Please note, if you have a 64bit installation, download and install the .msi 64-bit x64 installer on the link below.
When done, open your Downloads folder, right click the sp55094 installer, select 7-Zip, select extract files and then click Ok.
Open the newly extracted folder, right click on setup ( this is 5th from the bottom with a size of 368Kb ) and select 'Run as Administrator' to start the installation.
When this has completed, restart the notebook and let Windows fully load for a few minutes before checking.
Regards,
DP-K