Task scheduler question

[luc P. Faucheux]

What is the exact syntax for the Task scheduler on the command line?
I have: C:\commands\MSOP2K40_EXCEL.exe
"C:\LUC\Spreadsheets\Pricers\AutoCumVol.xls"
and it used to work fine,however our IT department upgraded the system
to :
"We are required to patch all the PC to Service pack 3 and Microsoft
RPC vulnerability patch"
and now when the task runs it produces 2 error messages:
1) '' could not be found. Check the spelling of the file name....
2) 'C:\LUC\Spreadsheets\Pricers\AutoCumVol.xls''''.xls' could not be
found. Check the spelling of .......

I tried to modify the command line by removing the .xls, the double
quotes, nothing works, it still comes up with those two error
messages.
I am at a loss.
Thanks,
Luc.