Yeah, wouldnt bother with that system. The CPU is about 3rs old and the graphics card quite a bit older.
To put that in context, a modern Core i3 (3220) will outperform that old i7.http://www.anandtech.com/bench/Product/46?vs=677
The card is so old that there isnt even the option to compare to modern cards, but even budget cards from last gen will outperform it by quite a bit.
Plus the issues raised about how used it is, HDD's and PSU's dont age well. The only thing I would consider salvaging would be the RAM and case (depending on model and condition), but you would have to get the whole thing for $100 for it to be worth it.