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.
And since Vista are not supported by Microsoft anymore, you'd better upgrade soon before you start holding crypto-assets in this PC.
It's more likely that a Vista PC will be infected by a virus since it's not being patched anymore.