ORA-12560: TNS:protocol adapter error ??

[anuragmin]

Hi,
Whenever I start my server manager I get a ORA-12560: TNS protocol adapter error. How can I fix this.

C:\>svrmgrl

Oracle Server Manager Release 3.1.7.0.0 - Production

Copyright (c) 1997, 1999, Oracle Corporation. All Rights Reserved.

ORA-12560: TNS protocol adapter error
SVRMGR>

Thanks
Anurag