I had icons like that in a different program when my hard disk was too slow to load them before Windows or (I think it was Bryce) said they were. 

Are you running both 7's on a mechanical drives? How much RAM have you got in each machine?  What is your graphics card?

It may be that your graphics drivers are the issue. Windows 7 could just be too old for the latest drivers you need.

You could try upgrading one of the PC's to Windows 10 or 11. As far as I remember if you have a genuine Windows 7 license you can upgrade to 10 for free. You have to search around for it though. I found this on the PC World website.

I'm guessing from the fact you have Poser Pro versions your Windows is 64 bit so an upgrade to 10 should be feasible.

Make sure you back up all your important files before upgrading and I hope some of this helps.