Forum broken following MySQL Upgrade from 4.x to 5.1
 

I have just upgraded my server from MySQL V4.x to V5.1 and am getting various MySQL errors such as shown below. I have backups from before and after the MySQL upgrade.

Can you give me some advice on how to resolve these MySQL errors. Will upgrading to vB3.5.3 fix this. I am considering upgrading to vB4, however reading the forums there seems to be a lot of people unhappy with it and suggesting to wait.

If I try and Repair All Tables I get:
"Check Error: Table upgrade required. Please do "REPAIR TABLE `access`" or dump/reload to fix it!

If I try and repair the 'phrase' table I get:
Error: Incorrect key file for table 'phrase'; try to repair it
Error: Corrupt

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Database error in vBulletin 3.0.0 Release Candidate 3:

Invalid SQL:
SELECT varname, text
FROM phrase
WHERE phrasetypeid = 5000 AND
languageid IN(-1, 0, 1)
ORDER BY languageid ASC

mysql error: Incorrect key file for table 'phrase'; try to repair it

mysql error number: 1034
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Thanks,
Neville