Hi, I am Dave, I will help you with this.
1
Windows should not start using virtual memory until your RAM is mostly all used up, please provide a screenshot of where you are seeing Windows is using high virtual memory.
2
Open Task Manager, then elect the Performance tab and click Memory on the left.
Please provide a screenshot of that window.
3
After you clean installed Windows, did you install a full set of device drivers from the support page for your laptop on the manufacturers website?