Select the table function you wish to perform - Check, Optimize, Repair or Analyze.
In the left hand menu frame of tables select each table and look for errors in the Indexes box in the right frame and correct accordingly, if any are found.
Differing versions of MySQL can be compensated for when importing a database - did you do this when/if importing your database as version compatibility can course issues?
Is the table minus an index the table giving issues?
The configuration file is located in the \xampp\mysql\bin directory and is called my.cnf or may be just called my (which may look just like a link) - drag this file into your text editor but make a backup (copy of) first before experimenting with the configuration items.
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