Game loads then freezes
Since it’s a used PC, you have no way of knowing if the OS is damaged or working correctly.
I recommend that you reformat and reinstall windows (use the 64 bit version since you have 4 gig of RAM).
Anytime someone gives me a used PC, I always format it to start fresh.
It wouldn’t hurt to invest in a little more RAM too, since Windows will take up some of that 4gb of Ram. Even if it’s only 2GB more, it’ll make a big difference.
Your current GPU also only meets min. requirements for Guild Wars 2, so, if you’re able, it wouldn’t hurt to invest in a slightly better one, especially if the plan is to get your fiancĂ© into gaming.