I have windows Vista which portfolio should I download?
Go here
https://github.com/ArkEcosystem/desktop-wallet/releasesScrolldown to ark-desktop-wallet-win-2.6.2.exe
Wait for file download and install on your pc, remember if you gonna hold a good amount of coins, backup your wallet.dat file in a usb. If you dont know how, let me know and i can post a thread about that.
Good luck.
My advice should be to get used to backing up any wallet especially with large assets because if you lose it will be very confusing and there is definitely no way to open it