WOW really? Thank you so much!!!
Looking at the minimum specs it looks like Watchdogs needs a quad core processor - which you have, but doesn't really care what quad core. The Q8400 listed was released, ohh, about 5 years ago. It's very
slow by modern standards (older architecture and only runs at something like 2.5Ghz). if that will run it, your chip will run it fine.