Will it run? Possibly but the CPU is pre Generation 8 and that system is not on the Dell list of compatible tested Windows 11 desktops here. You can download and run the PC Health Check app (available here at the bottom of the page) to see why the system does not measure up. However if you do install Windows 11, even if it runs, since Dell does not support it and you need service down the road Dell techs will insist that you install Windows 10 before they can offer assistance.
Will Windows 11 run OK on dell inspiron 3668? I guess by OK I mean will it run--period.  Please reply if you are running it on your Dell inspiron and let us know your experience. TIA.SweetTasha.
Windows 11 on dell inspiron 3668