I recently acquired a free refurbished (like new) Dell Optiplex 780 desktop. Windows 7 professional. Service pack 1. 64 bit operating system. Ram: 4.00 GB. The pc is working fine though a bit slow. Is it worth increasing my ram to 8 gb? I realize ms will stop issuing security updates this month. I'm considering, if practical, keeping windows 7 or changing over to Linux. Suggestions/recommendations appreciated.