It sounds like you scheduled it as a Windows job, not as an
Oracle job.
If you have the DB Admin module you can use this screen to
manage it, otherwise, just go to your Windows control panel and look up your
tasks. Look for one that has a call to ‘qsr.exe’ and disable it or delete it.

From:
toad@yahoogroups.com [mailto:toad@yahoogroups.com] On Behalf Of urfriend_friendy
Sent: Monday, October 06, 2008 8:24 AM
To: toad@yahoogroups.com
Subject: [toad] How to remove oracle job which is scheduled through
windows?
Hi,
Other day, I scheduled a procedure using toad 9.5 wizard.( I did so by
right-clicking in the navigation-pane of schema browser under 'Jobs'
tab) Instead of clicking 'OK', I scheduled it.Wizard prompted for
operating system (windows) user-id and password, which I supplied.Itz
running daily @ 4:10 pm from my system through 'Quest script runner'.
Note that I didn't supply explicit 'Commit' to the
aforementioned 'dbms_job.submit' script that I scheduled to run daily.
So, daily the 'quest script' is submitting my procedure
through 'dbms_job.submit' without any commit.
(Also Note that I don't have grants to see all the user jobs in Toad.)
Could you please help me in disabling it?