Problem when running Oracle XE (Express Edition)

My oracle Xe worked fine before 3,4 days but since yesterday that he did not. When I run "Go to database home page", the firefox me gives error that
"Unable to connect".
Firefox can't establish a connection to the server »

I also tried in IE but don't find any results.
Before yesterday, it worked fine.

Also then I connect via SQL command line, one entering the user name and password, the error message displays

ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist

Kindly help me in this situation

Tags: Database

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