I have been working on a problem for a few days now. Our local mediawiki page that sits on our box account, destroyed itself and we\'ve been working to get it online. Using
"Attempted to open a previously opened tablespace." -- That smells like one of these:
There are two copies of MySQL and both are trying to run.
Windows failed to release an 'open' on one of MySQL's files. I used to see that problem. It was cured by rebooting Windows; later by upgrading Windows.