Have you changed your screen text size in any way? Windows display preferences has an option to show text at 125%, etc which can cause some software and some display drivers to do strange things.
While you purchased a new graphics card (the likely culprit) - did you download the latest drivers for that card for your OS from the manufacturer's web site?
Which version of Windows?
Try (for testing only of course) creating a fresh user account on your machine and see if the behavior happens when you launch AC from that account.
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB