help! I screwed up my registry by renaming one folder...please tell me original name

[webazoid]

I went to \\\registry\HKLM: and was scrolling when i accidently renamed one of the folders to "d"....now my tp freezes. i can launch total commander but not do much else. can someone take a look and let me know what to rename the folder?

inside this folder, there's subdirectory with:
-htc
-ia stytle
-l&h
-microsoft
-midi engine
-scansoft


Audiocompression
buttonapps
comm
controlpanel
d [what's the name of this directory?]
drivers
dirvers32
explorer
extmodems
hardware
ident
init
loader
mui
nls
platform
security
services
snd
software
system
tapi
telephony
time
windows ce ser
windows ce tools