Enterprise Manager

I Successfully installed Oracle 10g on my system and am able to login to Enterprise Manager but couldn't perform database activities like Scheduling a backup, Performing Backup and Recovery etc. due to Operating System Login
Credentials problem. I am asked to supply Operating
System Login Credentials before I can perform any of
those activities.

I created a Windows account named oracle1 with admin
as the password. Presently, my database is UP, if I
shut it down and want to restart, I would be prompted
to supply the Host Credentials (Operating System Login
Credentials). Supplying oracle account results with
the following error:
Validation Error
Examine and correct the following errors, then retry
the operation:
Error: Connection to host as user oracle failed:
ERROR: Wrong password for user

I logged in with the oracle account to my local system. The password I supplied for the oracle account is
correct. Also in Local Security policy I set my Oracle1 account as part of Operating System. How do I overcome this problem? What
Operating System account should I use? I located an
Oracle group account in Windows ORA_DBA, mapped the account to it, and retry logging in using this account but to no avail.

I would appreciate it so much if you can help me solve
this problem as soon as possible.

Somayeh Dodge
S2dodge@yahoo.com