This is in danger of becoming a saga ...

First do as Noo suggested .... start in safe mode(press f8 a lot as you turn on) & remove any reference to sound items from 'sound video & game controllers' in device manager (you can zap everything in that category if you like - if we kill anything that really wants to be there windows will helpfully re-find it for us later). This is without the 'new' s/c fitted ....

Here are the instructions for diabling onboard sound I 'lifted' from the HP site ...

"To enable/disable the onboard sound chipset follow these instructions:

Power the PC on.
When the Blue HP Invent screen appears, press the F1 key repeatedly until Entering Setup... appears.
Use the cursor keys to go to Advanced.
Using the cursor keys, go to Onboard Audio Options, or I/O Device Configuration, press ENTER.
Using the cursor keys, go to Onboard Audio Codec or Audio Codec.
Perform the following steps to enable or disable the sound:
To enable, select Enable or Enabled and press ENTER.
To disable, select Disable or Disabled and press ENTER
To exit and continue, press the F10 key, press the Y key, and then press ENTER. "

But errm they don't seem to say just where stuff might be ... which is the problem !!

When you 'open' bios (press f1 or del like 'mad') You ought to get a screen like this ...


Then we want 'integrated peripherals' (but if you look above they say 'advanced') like this ...


Its fairly obvious, but I'll say it anyway, we want anything 'sound' connected off / disabled ... you'll need to look in all the options for any references to 'midi' or 'gameport' & check those are off too ... then hopefully all these references in device manager will be 'really' gone.

Note these are 'generic' bios screenshots ... I couldn't find any for your particular bios ... there will be differences !