Windows Vista symbol files can't find,breakpoint can't set

I debug printer driver program with WinDbg .but WinDbg don't permit to set breakpoint ,symbol information for the current line could not be located in the currently loaded symbols. dugger suggests searching the remaining symbols.

I have downloaded symbols from microsoft server,and symbol path is set correctly.but WinDbg gives out the clew:

0: kd> .reload /f
Connected to Windows Vista 6000 x86 compatible target, ptr64 FALSE
Loading Kernel Symbols
........................*** WARNING: Unable to verify timestamp for msrpc.sys
*** ERROR: Module load completed but symbols could not be loaded for msrpc.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 drmk.sys
.*** WARNING: Unable to verify timestamp for Fs_Rec.SYS
*** ERROR: Module load completed but symbols could not be loaded for Fs_Rec.SYS
.*** WARNING: Unable to verify timestamp for Null.SYS
*** ERROR: Module load completed but symbols could not be loaded for Null.SYS
......*** WARNING: Unable to verify timestamp for Msfs.SYS
*** ERROR: Module load completed but symbols could not be loaded for Msfs.SYS
..........................*** ERROR: Module load completed but symbols could not be loaded for spsys.sys
..............*** ERROR: Module load completed but symbols could not be loaded for secdrv.SYS
...*** WARNING: Unable to verify timestamp for ATMFD.DLL
*** ERROR: Module load completed but symbols could not be loaded for ATMFD.DLL

Loading User Symbols

Loading unloaded module list
.....

I want to set breakpoint ,How can I solve the promble ?,help me ,please,thanks!