Better late than never?
Anyhoo, wrap a for statement around your reg query to parse the output of the reg query for the part you want.
(all on one line)
for /f "skip=4 tokens=2*" %a in ('reg query HKLM\SYSTEM\CurrentControlSet\Control\TimeZoneInformation /v standardname') do echo %b
skip=4 if for XP, =2 for Win2K3
double percents (%%) if it's in a batch file
echo %b can be replaced by most any valid statement