Windows :: 11g Service Not Starting Automatically On Win 7 Professional?

I installed Oracle 11.2.0.1.0 Enterprise Edition on my home laptop computer running Windows 7 Professional months ago, set the services to start automatically and it had been working fine, with multiple shutdowns and re-starts per day, until today. I was using it earlier today, then shut the laptop down, went to lunch, turned it on again, tried to login through SQL*Plus and got:

SQL*Plus: Release 11.2.0.1.0 Production on Sat Feb 12 15:48:39 2011

Copyright (c) 1982, 2010, Oracle. All rights reserved.

Enter user-name: scott/tiger
ERROR:
ORA-12560: TNS:protocol adapter error

Enter user-name:

I tried restarting the computer, but still got the same result as above.I went to:

Control Panel -> System and Security -> Administrative Tools -> Services

and confirmed that the Oracle services were still set to start automatically. The OracleOraDb11g_home1TNSListener showed started. The OracleServiceORCL showed that it was set to start automatically, but did not show started or starting or stopped. The only option displayed for it was start, not pause or stop or restart, implying that it was not started. My computer had been on long enough that it should have started and it did not show that it was trying to start or give any indication that it had tried to start and failed and showed that it was set to start automatically.

I clicked on the start option, it started, and I was able to login. If I have to, I can live with this as a workaround, but I would prefer that it start automatically like it is supposed to. I find it puzzling since it had been working and I did not change anything, at least not intentionally. The only thing that I can think of that I did differently recently was experimenting with cursors and dbms_sql in order to intentionally reproduce the error "ORA-29471: DBMS_SQL access denied" to demonstrate it in response to a thread on the SQL and PL/SQL forum: [URL]. However, after reproducing the error, I corrected it and was still able to exit SQL*Plus and log in again until I shut down the computer and re-started. I don't know if this is related or coincidence.