It's not Windows 7. It's the 52 warnings and errors at https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.keyzet.com%2F
Time to shame your web master.
Hi! i am using Windows 7 and running a website ****://www.keyzet.com
I am facing issue that thumbnail of the website shown broken while using windows 7. n other operating system, its running fine.
Note: Link disabled by moderator.