SDP6 fails to start after SDP7 upgrade failed

I recently attempted to upgrade my SDP6 6015 to SD7, the upgrade failed and indicated a rollback. SDP now fails to start.
The following events were logged:

Event Type: Warning
Event Source: MySQL
Event Category: None
Event ID: 100
Date: 2008/05/13
Time: 10:51:51 AM
User: N/A
Computer: JNBCWSSRV03
Description:
Can't open and lock time zone table: Table 'mysql.time_zone_leap_second' doesn't exist trying to live without them

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Event Type: Error
Event Source: servicedesk
Event Category: wrapper
Event ID: 100
Date: 2008/05/13
Time: 10:52:00 AM
User: N/A
Computer: JNBCWSSRV03
Description:
There were 1 failed launches in a row, each lasting less than 300 seconds. Giving up.

Event Type: Error
Event Source: servicedesk
Event Category: wrapper
Event ID: 100
Date: 2008/05/13
Time: 10:52:00 AM
User: N/A
Computer: JNBCWSSRV03
Description:
There may be a configuration problem: please check the logs.

I have as yet been unable to find a resolution and urgently need to get my SDP up and running again. Any assistance would be greatly appreciated.