You are not completely clear in your explanation...
If you have two Graphics-Cards on your computer, then if you are currently set up to use the 'poor' one, then you need to open the NVIDIA Control Panel and ensure that SketchUp is set to use this better GC under 3d-apps, and also let SketchUp choose its own settings...
Having had a major system failure and rebuild has probably meant that your computer's GC settings are set up wrongly...