Hi,
Thank you for writing to Microsoft Community Forums.
I appreciate your interest in Windows 10. I understand that you want to know whether Intel Pentium G645 will run Windows 10.
There are some older computers, which support Windows 10. Ideally, you may also require Windows 10 supporting driver and firmware updates from the hardware manufacturer. However, it would be advisable to upgrade your computer hardware, to avoid any issues that may arise due to compatibility. Keeping updated drivers, will allow smooth running of Windows 10.
Let us know if you need any further assistance, we will be glad to help you.
Regards,
Nikhar Khare
Microsoft Community - Moderator