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Let me preface this by saying that I wish I could have come up with a more specific title for this post, but I'm almost literally unable to do anything in Calibre.

I'm unable to do the following without my Calibre freezing: run welcome wizard, click on any button within the preferences, edit metadata or convert any files.

I've installed all Windows updates, done a system restore to remove them, uninstalled and reinstalled multiple versions of Calibre trying to fix it, but I'm just a novice and a lot of the suggestions on this board are honestly going over my head.

I'm running Windows 7, 64-bit and trying, at the very least, to convert files to .mobi.

Thanks in advance.