Just For your information..
Adobe CS4 Master is not supported on Windows 7 (as what I can see on there website)
I also do not have Adobe so Sorry Check with Adobe Support..
Hope this Helps.. EDIT: ALSO DOES NOT SAY 64bit
here is the fine print about 64bit..
†Adobe Photoshop® Extended and Acrobat® Pro natively support 64-bit editions of Windows Vista. Adobe Premiere® Pro, After Effects®, Soundbooth®, Encore®, and Adobe OnLocation™ are certified on 64-bit Windows Vista.