Restore oracle xe problem

I am trying to restore oracle XE by cli开发者_如何转开发cking (run as administrator) Restore Database from Start menu -> All Programms ->Oracle Database 10g Express Edition. After entering yes to the confirmation question the error messages appear.

Messages are:

RMAN-00554: Initialization of internal recovery manager package failed

RMAN-04005: error from target database:

ORA-12560: TNS:protocol adapter error

Error: Restore of the database failed.RMAN Error- could not startup dummy instance.

The tnsnames.ora file is in place,the OracleServiceXE and OracleXETNSListener services are running and I am able to connect to xe with sqlplus. What is strange is this problem happened to me a few days ago, after I restarted the machine for a few times it workd and I was able to rstore.This time I couldn't make it work at all.

If it helps,I am running win 7 and I have Oracle 10g client and Oracle 11g client installed on my machine.

Thanks in advance for your reply.

Is your database server configured for DHCP? If so, you'll need to install the Microsoft Loopback Adapter. Your reinstallation may have just temporarily made the problem go away.