Oracle 10g Backup Woes

My backup attempt totally messed up my system... can anyone shed any light?
Login to the EM as System / Normal.
Maintenance -> Schedule Backup
Select Customized Backup: Whole Database
Backup Type: Full Backup
All other options are unchecked.
Backup to Disk: Disk Backup Location e:\backup
Set backup to start immediately.
It gives me a warning that this is an offline backup and that it will shut down the database. This is ok. The RMAN script that gets generated is:
backup device type disk tag '%TAG' database include current controlfile;
I click Submit Job and it forwards me to the Status page.
So I wait and wait. I eventually give up and goto the main page of the EM and it asks me to login.
I try to login as System and it tells me:
The applicaiton requires more database privileges than you have currently been granted.
Any ideas? I can login via SQLPLUS as System but not into the Enterprise manager.

I am just following the steps in the oracle 2dayDBA documentation. It did not specify any user and I don't know any better.
My problem now is that I cannot login to the enterprise manager. Even as SYS as SYSDBA it tells me I have insufficient priviliges.
I have previously logged on with these usernames, but now I am locked out. Do you have any ideas?

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Please do not dump all of your work in this forum, and expect volunteers to do it for free!!!
Dear Great Senior DBA Sybrand Bakker
What are Oracle Discussion Forums?
Oracle Discussion Forums is an interactive community for sharing information, questions, and comments about Oracle products and related technologies. Most forums are moderated by product managers, and all of them are frequently visited by knowledgeable users from the community
oracle forums is not your place for showing “bossing” it is a place where junior to seniors share there knowledge and advices, it means helping and sharing….. Knowledge is for giving ….giving only it will increase… don’t discourage any one like this ……
There are my Great Seniors (not like u) mainly respected Mr. Jonathan Lewis, Mr. Don Burleson and a lot of oracle nominated ACE members are all giving patiently replay to jr. to sr.
Obeasley oracle doubts are mostly related to practical issue only……
Pls try to learn the word meaning of “volunteers”

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