Object library invalid or contains references to object definitions that couldn't be found

I've recently been using a lot of ActiveX check boxes to hide/show certain rows when they are checked or unchecked, and upon running Excel this morning, I've found that I'm getting an error that says "Object library invalid or contains references to object definitions that could not be found" any time I try running one of my ActiveX check boxes.

I've looked into the error a bit via google, and I've found 3 solutions that seem to work for many people, but none have worked for me thus far. The first solution I tried is navigating to appdata/roaming/microsoft/forms and then deleting all .exd files, but to my suprise, there weren't any there. I also believe someone said running Excel should create these .exd files if they are missing, but that isn't happening either.
The second solution I tried was using the command prompt to navigate to Document and Settings, and delete the .exd files via the code "del /S /A:H /A:-H *.EXD", which also failed.
The third solution I tried was going into the Microsoft Visual Basic --> Tools --> References --> Browse --> Navigate to System32 Folder --> Open MSCOMCTL.OCX file --> Make sure Microsoft Windows Common Controls is checked; this has also failed.

Can anyone think of any other possible solutions I could try?

I went to Control Panel --> Folder Options --> View and made sure "show hidden files and folders" was checked, as well as "Hide protected operating system files" was unchecked (I'm on a vista by the way); my search isn't finding any .exd files.

I did a search on all my folders. I'm looking at both the Excel folder within the Roaming/Microsoft Folder, and theres only two files total (~arF599.tmp and Excel12.xlb) and an empty Folder (XLSTART).

Alright, In the Excel8.0 Folder I am finding a file "MSForms.exd", but even after I delete it, I'm still getting the same error (and it reappears in the folder).

It is correctly reappearing then, but unfortunately it is not fixing the error, and yes, it is the only .exd file I'm finding anywhere on my computer (with the correct hidden / system folder settings). I also tried the other solutions I've seen around the forums listed in my original post and those have failed to work again also.

Upon further playing around with my sheet, it seems my first sheet is the only one having issues. I'm able to create new ActiveX check boxes on Sheet 2 and use the same code I did on sheet 1 and it works fine, whereas I can create new check boxes on Sheet 1, but they won't run a macro or any type of code.

I could use either, and I'm actually using both. The Form check boxes prompt the error listed above, while the ActiveX simply don't do anything at all.