hosting server session problem

[eluser]rajyakshmik[/eluser]
I m working in both IE and Firefox.Firefox it's working fine both locally and server.In IE i m not getting session value.I included session.ph in application/libraries/session.php.
I m getting following errors

A PHP Error was encountered
Severity: Warning

Message: session_start() [function.session-start]: open(c:/wamp/tmp/sess_dc82bfda184f6dd3b4206c683b8772b2, O_RDWR) failed: No such file or directory (2)

Filename: libraries/Session.php

Line Number: 141

A PHP Error was encountered
Severity: Warning

Message: Unknown(): open(c:/wamp/tmp/sess_dc82bfda184f6dd3b4206c683b8772b2, O_RDWR) failed: No such file or directory (2)

Filename: Unknown

Line Number: 0

A PHP Error was encountered
Severity: Warning

Message: Unknown(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (c:/wamp/tmp)

Filename: Unknown

Line Number: 0

Can i include both system/libraries/session.php and application/libraries/session.php.Please let me know the solution.

Thanks ,
Rajyalakshmi K