Pro Tools LE 7.4 and Pro Tools M-Powered 7.4 are compatible with Windows Vista (32-bit) Ultimate and Business ..... Windows Vista 64-bit OS installation (any version) is not compatible with Pro Tools....
Windows Vista SP1 — Not Qualified
Please note that Pro Tools LE and M-Powered are not supported on any available versions of Service Pack 1 for Windows Vista. Digidesign will announce Vista Service Pack 1 qualification with Pro Tools as soon as all testing is complete.
Microsoft currently plans to make Windows Vista SP1 available to Windows Update and to the download center on microsoft.com in mid-March 2008. In mid-April, Microsoft will begin delivering Windows Vista SP1 to Windows Vista customers who have chosen to have updates downloaded automatically.
Please do not install Windows Vista SP1 on any Pro Tools system until it has been officially qualified by Digidesign.
Unless u got Vista Ultimate or Business ..... Might have to wait