How can I install the HDLP 3.0 on Windows XP / Vista 64 bits ?
No. HDLP is 32bit only at this time.
Do you know if the next relase will provide support for 64bits ?
Due to the McAfee Host Data Loss Prevention software version 9.0 requirement for .NET 3.5, Windows 2000 server is not supported.
Not until DLP 9.1.
HDLP 9.0 was just released but it's 32 bit only.