Audio and Graphical issue

I have had Cubase 13.20 for almost a week it does not work properly. With graphics errors and settings issues is there a fix for this or have i just wasted $850
please advise
Alan
My System
Processor Intel(R) Core™ i7-8550U CPU @ 1.80GHz 1.99 GHz

Installed RAM 32.0 GB (31.9 GB usable)

System type 64-bit operating system, x64-based processor

Windows 11 Pro