If you're running win 10 pro 64 then according to this link
How much RAM does your Windows 10 PC need? (2019 edition) | ZDNet
4GB and you're OK but only just, update to 8GB and your cooking with gas. From this link
Foxconn H55MXV - Best Compatible Foxconn H55MXV Mobo (pc-specs.com)
it looks like it is VERY dated but you could try picking up 4GB of memory on Ebay and see what happens, again from the link you need DD3 1333Mz memory.