Perhaps you can take a look this few tutorial link first:
http://www.sevenforums.com/tutorials/12444-task-scheduler-create-new-task.html
http://www.7tutorials.com/how-create-task-basic-task-wizard
After that you can follow my below instruction setup in Windows scheduler
Action configuration page.
STEP 1 :
Set your site name in JoomlaFolder/components/com_easyblog/cron.php
// LINE 18
$host = 'site.com';
// Replace to
$host = 'clientonly.americas.nttdata.com';
STEP 2 :
Find one of the program can execute the command (e.g. this is my local php.exe location path)
"C:\Program Files (x86)\PHP\v5.3.28\php.exe"
STEP 3 :
this is the add argument (optional): (find your site cron.php path)
-f D:\Website\intranet-test\components\com_easyblog\cron.php
STEP 4 :
Try open command promp then test the command is it setup correctly (make sure that path is follow back on your site.)
php.exe -f D:\Website\intranet-test\components\com_easyblog\cron.php"
Hope this will help.