Hi,
Please do try these troubleshooting steps that may help.
- First, do observe your laptop in Safe mode and see if it will still lag or be slow.
- If it's still lagging or freezing in Safe Mode that can be an indication that the HDD is going back.
- Do a virus/malware scan first just to be sure it's not an infection which causes this problem. Please use the link below.
-
http://www.tomsguide.com/faq/id-1691891/removing-malware-proven-completely-remove-bitcoin-mining-malware.html
- If after the virus/malware scan and the same problem will persist, I would suggest reinstalling Windows.
- And if after reinstalling Windows will still not work that means you'll need to replace the HDD.
Do also consider doing a clean install of Nvidia graphics card.
- Go to Device Manager and uninstall the Nvidia graphics driver.
- Open Programs and Features then uninstall anything related to Nvidia.
- Once uninstalled, download and install the latest driver.
- Here's the link:nvidia.com/Download/index.aspx
- Reboot your laptop once the driver has been installed.
- After the reboot make sure to set Nvidia as the default GPU.