Check your IP address: 127.0.0.1 is a reserved address used for internal loopback testing, and should not be used for a server...
"how doing test"
On the oracle server, run up a command shell (Start button...run, then type "cmd" in the dialog, and press ENTER)
At the command line prompt, type "IPCONFIG" and press ENTER.
It will display information similar to this:
Windows IP Configuration
Ethernet adapter Local Area Connection 2:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.0.1