But if its simply an adware program that came preinstalled it might be better to leave it alone.
Hmmm... Why? Are you affraid to avoid restoring of the partition if you manage it?
My concern was, if this was part of an broader installation or archive file that is normal to the computer, the ability to recover other programs might be removed with the adware. If the adware is of the more benign type that comes pre-installed on HPs its better, imo, to leave it rather than risk damaging anything. If it is this type it would normally only reinstall to C: if requested by the user anyway.
Searching those 2 file names, however, implies there was more going on than just pre-installed junk programs.
@ ryan - Are you sure those 2 files were found in the D: drive, or were they in System Restore? The recovery partition and System Resore are different things.