Hi, I'm new here, I just wanted to give an update on this issue.
I had the "Mass Storage Controller" device, I solved by downloading 'DP_Misc_wnt5_x86-32_7095.7z' file and found the right controller in folder 'D\3\X\T\'.
Helpful hint: try looking for *.inf files with a partial hardware ID, my ID for this device is:
'PCI\VEN_104C&DEV_8033&SUBSYS_308B103C&REV_00\4&1C88B56&0&23A4', so I looked for 'PCI\VEN_104' and I got 2 hits, from which one of them was the right one.
Hint 2: in the properties window of the divice, go to details tab, the 2nd option of the pooldown menu are the short versions of the hardware ID, to look for them in *.inf files. The 3rd option are compatibles hardware ID that also can be used as short versions of the main hardware ID.
Good luck 
I'm happy with my device correctly installed *does the happy dance*
Almost forgot, thx so much for the driver, this wasn't in HP web site and I downloaded ALL drivers for this Notebook (HP Compaq nx6125).
Saul
PC Technician.