Hi treasurerlgfaith,

We do not recommend having two QuickBooks program on one computer. This setup may cause slowness and errors when running the programs. However, I won't recommend purchasing another computer right now. Instead, we'll do the steps in the articles shared in the previous replies. It seems like you already tried some of them.

If none of the articles resolve the performance issue, please have this checked with our Support. They can do a screen-sharing session to check your company file for investigation purposes.

You can contact our Support using JamesDuanT's answer above.

Keep in mind that we're always here to help you with QuickBooks. You can also find articles by going to Help and choosing QuickBooks Desktop Help.