Connect to Oracle XE from Toad?

I installed Oracle Express and Toad 9.2 trial version on Vista Ultimate machine. I can connect to Oracle via the Home Page but get
ORA-12154 TNS could not resolve connect identifier when I try to connect to XE.
I added TNS_ADMIN environment variable (system) but this did nothing.
How do you connect to ora express from Toad?

XE=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST=BellaScout-PC)
(PORT=1521)
(CONNECT_DATA=
(SERVER=dedicated)
(SERVICE_NAME=XE)
The TNS tab in toad has the following options:
XE
EXITPROC_CONNECTION_DATA
ORACLR_CONNECTION_DATA
The installed clients in Toad available:
XE
(Oracle Root)

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