OPEN MULTIPLE ULS - Run-time error in Excel 2013

Apologies if the question has been asked before, I certainly couldn't find any mention of it. I created macro some years back in Excel 2003, I have since upgraded to Excel 2013, the macro runs. but throws a Run-time error.

Excel Error Message.JPG

The macro is designed to open multiple URLS, it does two then stops.

Error Code Picture.JPG

I can't for the life me see what it is that's stopping it. I've also seen some other macros throwing a similiar error after working. Is it something to do with the upgrade to a later version of Excel???

Any help would be greatley appreciated.

Thanks for the response, I've since discovered the macro works on my home pc. Is there a reference or object that I need to activate for macros to work normally. As when I run it at work it throws the errors I mentioned?

So nothing I can directly resolve without approching the administrator?

It seems strange that it can process two URL's then stop.

Here's the workbook.

Toolkit.xlsm

I am using Windows 7 and Explorer 11 at work but Windows 10 and Edge at home.