Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
You have to list all your components for an accurate picture.
If you budget allows, I would recommend a new Corsair 520HX.
If your computer only has one hard drive, one or two fans and one optical drive you'll probably be okay with 350W assuming it's a quality PSU that can actually push that number. Some off-brand units say 350 but can only push 250 or less.