It' The SFZ Name.

Ok, I see. I've got 37 sfz files in the Hi Toms folder but none of them with such a name. Maybe you've got some SD3 expansion pack that I'm missing. Sorry, can't help you then.

First of all, is it session drummer 3 / or studio drummer ?
 
if its session drummer 3:
right click on the hi tom (the drum kit piece itself)
choose "Load instrument". pick an SFZ file from the hi tom files.
 
in the future you would be better off loading a kit Vs. loading individual samples. (if that's what you did).
how did you load your kit ?
 
If its studio drummer (from Native Instruments):
your in the wrong part of the forum. This is for Sonar related issues.
 

DELETED

SI-Drums

It could be an incomplete installation.
 
Depending on whether this is a 64bit or 32bit install the default location could be
C:\Program Files\Cakewalk\Studio Instruments\SI-Drum Kit\Kits
C:\Program Files (x86)\Cakewalk\Studio Instruments\SI-Drum Kit\Kits
 
The folder should contain 598 files in 27 folders
 
If you show fewer files, run the X3 install, choose the advanced install option (this is the screen immediately after the serial number screen) and when the check list appears, deselect everything except the Studio Instrument Suite.

arimalan
HiTom Dry Is Missing :) Hope I Don't Have To ReInstall.

There's no bid deal with reinstalling. You do a Custom Install and choose Studio Instruments (I don't think you can just do the drums by themselves).
 
** Edit:  scook beat me to it (Post above mine) .  Just follow his instructions.