Help getting SQL Developer to work

Question

I'm just trying to get SQL Developer to work so I can use student databases. I have no intent of being a networker, and I definetly have no intent of failing this class because I can't do my homework.
Update.
Someone from my Java Class told me to restart the services related to Oracle. I attempted to do so, but got the following errors:
http://img220.imageshack.us/img220/5087/clipboard01hq.jpg
http://img27.imageshack.us/img27/32/clipboard02ro.jpg
I believe the TNSListener service is the main problem (seeing as when I try to open the database I get an error saying "TNSListener service is not running.") So I looked that up, and it said to check sqlnet.log:
Sat Jan 29 18:11:16 2011
Create Relation ADR_CONTROL
Create Relation INC_METER_IMPT_DEF
Create Relation INC_METER_PK_IMPTS
Directory does not exist for read/write [C:\app\Davidi\product\11.1.0\db_1\log] [C:\app\Davidi\product\11.1.0\db_1\log\diag\clients]
Fatal NI connect error 12541, connecting to:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SID=orcl)(CID=(PROGRAM=C:\Install\sqldeveloper-2.1.1.64.45\sqldeveloper\sqldeveloper.exe)(HOST=THE-FALCON)(USER=Davidi))))
VERSION INFORMATION:
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 11.1.0.6.0 - Production
Time: 29-JAN-2011 18:11:18
Tracing not turned on.
Tns error struct:
ns main err code: 12541
TNS-12541: TNS:no listener
ns secondary err code: 12560
nt main err code: 511
TNS-00511: No listener
nt secondary err code: 61
nt OS err code: 0
Thu Feb 03 23:04:39 2011
Directory does not exist for read/write [C:\app\Davidi\product\11.1.0\db_3\log] [C:\app\Davidi\product\11.1.0\db_3\log\diag]
Fatal NI connect error 12541, connecting to:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=The-Falcon)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcl)(CID=(PROGRAM=C:\Install\sqldeveloper-2.1.1.64.45\sqldeveloper\sqldeveloper.exe)(HOST=THE-FALCON)(USER=Davidi))))
VERSION INFORMATION:
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 11.1.0.6.0 - Production
Time: 03-FEB-2011 23:04:41
Tracing not turned on.
Tns error struct:
ns main err code: 12541
TNS-12541: TNS:no listener
ns secondary err code: 12560
nt main err code: 511
TNS-00511: No listener
nt secondary err code: 61
nt OS err code: 0
Thu Feb 03 23:08:05 2011
Directory does not exist for read/write [C:\app\Davidi\product\11.1.0\db_3\log] [C:\app\Davidi\product\11.1.0\db_3\log\diag]
Thu Feb 03 23:08:31 2011
Directory does not exist for read/write [C:\app\Davidi\product\11.1.0\db_3\log] [C:\app\Davidi\product\11.1.0\db_3\log\diag]
Thu Feb 03 23:09:36 2011
Directory does not exist for read/write [C:\app\Davidi\product\11.1.0\db_3\log] [C:\app\Davidi\product\11.1.0\db_3\log\diag]
And now I'm stuck again. Does anyone have any suggestions?

Answer 1

Oh right. I did change the port in an attempt to get Scott to work.
Changed back to port 1521, but still no luck.
I think my problem has something to do with OracleDBConsoleorcl. I get Error Code 2 when I try to start that service up.
Although...my SERVERNAME_SID is 192.168.15.101_orcl (Directory: C:\app\Davidi\product\11.1.0\db_1\192.168.15.101_orcl)
Which was the IP Address ipconfig set up the day that SQL Developer was actually working. Of course, that IP Address changes every time you restart windows. My teacher suggested that I set up a static IP Address or try setting it to local host, but I really don't know how to do either of those.
Any help would be appreciated.
Thank you.