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[BigJimTheLug]

....

[SEOvB]

Try to reupload plugin.php into your adminCP folder

Looks like it could be a hosting issue as well.

[killa seven]

The most i can tell you is disable the products for now, isntead of uninstalling them, until someone can fully help you man.

[Dismounted]

Make sure "class_dbalter.php" has been uploaded to the /includes directory.

[SEOvB]

thank you, this points me in the right direction.

--------------- Added 1232772968 at 1232772968 ---------------

yes, it is in there, but it says the file size is "0". Is this correct?

No thats not correct for a filesize, try to delete it and reupload the original one

[killa seven]

Anyone else have access to your FTP?

[Dismounted]

How can this happen? This is serious!! Help..
No, it's not really serious. Most likely, while uploading the files, FTP blipped, and the file didn't get uploaded properly. It happens.