OUCH this Acer thing only have a 220W PSU .... Acer.com X3200
Well you cant really go anywhere with this. The better card this can power is a 9500gt/9600gso but this PSU gona get hot and this is going to reduce its lifespan.
PLUS you CPU is ... SLOW. NM if its a quad, 1.8ghz is slow. If you think of gaming with this youll need to upgrade few parts. ( PSU/CPU/GPU )
have fun !