I just saw at FileForum that Nvidia has released a new set of drivers for both Vista and XP.
This drivers are WHQL Candidate as stated on Nvidia’s download page so i think they are not a Beta release.

The Download Drivers page at Nvidia’s website doesn’t show them either as Beta or Final but you can get them at the link below.

Maybe Nvidia didn’t rolled them out because they are waiting to get them WHQL certified but I’m trying them since the last beta released had some odd behavior on some games.

Website Vista | XP

• Nvidia ForceWare Drivers 169.21 WHQL Candidate
• Nvidia ForceWare Drivers 163.75 WHQL
• Nvidia ForceWare Drivers 175.16 WHQL
• Nvidia ForceWare Drivers 175.16 Beta
• Nvidia ForceWare Drivers 178.24 WHQL