i was under the impression you want it only for basic "office" usage (browsing , watching movies , youtube etc.)
if you ask whether or not you can turn it into a gaming pc by adding more powerful video card than the answer is no
no matter what video card you put in , because your system is obsolete
you can play very old titles or undemanding simple games ,
but any modern/more powerful video card would be massively bottlenecked by your cpu in more demanding modern titles .
just start saving money to build a new system .