Are you running Windows 32 bit (rather than 64 bit)?
Windows 32 bit restricts to 4GB in total and, in practice, due to some overhead it never gets to 4GB (although 2.75GB seems on the low side). I typically see 3.4GB.
What’s the difference between VPN and Antivirus and do you need both?
The story behind Royal Mail's new video game stamp set
Apple AR glasses release date rumours, features & patent news
Les meilleurs smartphones chinois disponibles en France (2020)