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.
This is what I have.
AMD Athlon 64x2 Dual core processor 4200+
2.20 GHz 2 GB of ram
Will windows 7 64 bit be OK to use? Will CS3 and PortraitProfessional 8 work with it?
Spec wise, you're perfectly fine. Having 2GB of ram is good. What you need to worry about is if drivers are available for your add-ons. Most likely your motherboard/nic etc will have drivers built into 7 but for peripherals, etc. you'll have to check for those yourself since I don't know what you have.
It's fine, but a bit unnecessary to run an x64 OS on a system with only 2GB. I would suggest adding 2GB more of RAM. You'll be able to fully utilize all 4GB and should notice a significant boost in system performance.