Help..can't log in as administrator

I set up a set up a new administrator account and new a standard user
account. For some reason...don't ask me why, just plan stupid, I set my
new standard account as the adminstrator and the old adminstrator
account to a standard user. Now when I log on it does not give me the
option to log into the admin account so that I can change things back.
I have done some research online and am not able to be successful in
applying any of those suggestion. I am not technically inept,
obviously, so be gentle and clear, but simple. Currently I am not able
to access many of my options since I can only log on to the standard
account. PLEASE HELP. My computer and sytem details are: Vista Home
Premium, 32-bit operating system with AMD Atholon(tm) 64X2 dual cor
processor, with 4 GB memory on a eMachine, model T5230.

Try to login in build-in administrator account and make diagnose &
repair.If there is no any administrator account build-in admin should
appear in safe mode -if not you have to enable build-in admin remotely

There are many various methods to do that:

link I:'What do I do: I can no longer log in or elevate to an
administrator account'

apart of above methods alsoTools for reseting password also have option
to enable/disable accounts (for built-in admin also) for example
'Offline NT Password & Registry Editor'
(http://home.eunet.no/pnordahl/ntpasswd/)

I just create a blog about how to reset windows password.
it might help you.
just have a look at

I have vista home premium. now i can't log on to my admin account even
with the correct password the welcome screen goes on endlessly & i have
to power off.

The only other account is a standard user account which is working fine
otherwise but i can't access my 40 gb data that is on the admin account
is can't do system restore nor cmd command prompt as in all cases UAC
is asking for admin password first and that profile is corrupted.

please advise how to save & access my valuable data & get admin
priviliges again.

See my previous post :sleepy: how to enable build-in admin account

I guess Link II is for user account password recovery only & I will
have to follow IInd process i.e. hard way.

It seems hard to me I am not that IT savvy.

All methods to enable admin account are relative difficult - remember
NT systems are protected before permissions escalations.I think OPTION
II from link I is the most easy (there are also pictures),OPTION III
from link I is harder but I attache below additional advices helpful to
undarstanding this method and make this method easier:

how to edit registry from WinRE -read all from post 17 this thread:
'Can't Delete Registry Key'

the same method I presented

But of course all methods are good -your decision what you choose...