Where do i get symbols for Wdf01000.sys

NTDEV
1

I got the OS symbols for vista 5520 build. But when I try to load the
symbols the windbg is cribbing:

*** ERROR: Symbol file could not be found. Defaulted to export symbols for
WDFLDR.SYS -
*** ERROR: Module load completed but symbols could not be loaded for
spldr.sys
*** ERROR: Module load completed but symbols could not be loaded for
Wdf01000.sys

This happened for few other .sys files as well.

Where can I get symbols for Wdf01000.sys.

Thanks,
-Praveen