Cool, glad you got it sorted. let me know if you need any other help.
Just try your GPU and if that does not work maybe you will need to check some chipset drivers as well
Mmm, this should not cause any issues. area you getting this issue when your settings is on potato mode and all the quality settings on low? If so, then it might be apps in the background that causes your PC to freeze a bit or it could be drivers. When i get issues like this...
How much RAM does your PC have? What graphics card do you use? what is your CPU's spec? Do you have the latest drivers for everything in your PC? These are the stuff that might be the issue.