Annoying rough edges to text

I have used Adobe Illustrator for years on my Mac, however I recently purchased a laptop with Windows 10 and downloaded the recent Adobe illustrator version. When using Adobe Illustrator on the laptop there is this bizarre rough edge to text. I understand that I'm creating vectors and so unless I set some effect the edge of the text should be sharp. I have anti-aliase artwork ticked and I have reset my Alprefs file. As you can see I'm zoomed on at 800%. On the Mac the edges would be sharp. Is this something to do with Windows?

Adrian