C:
cd "C:\Program Files\cognos\c8.4-disp_1\bin"
C:cogtr.exe -n2 -i -s "D:\Path_of_ur_model\Model_name.pyj"
The above code will run ur cube autiomatically.
Write the above code in a notepad and save it as .bat.
From Controm panal goto schedule and tasks. Here create a schedule task and assign the avobe create .bat file to this schedule task and use the previous reply settings to run ur cube as ur requirement.
cscript D:\Ptath_of_ur_VB Script file\VBScript_File_Name.vbs
If you want to check the errors you have to write a VB Script file. If you have VB Script file add this line ( cscript D:\Ptath_of_ur_VB Script file\VBScript_File_Name.vbs ) in your .bat file.
ejoy