Dell has Vista 64 bit drivers so Win 7 64 bit should work without problems.  Any drivers you need, after installing Win 7, you can download from HERE  Win 7 will install most drivers but you will need, at a minimum, the Dell RealTek (Integrated audio) sound driver as the Windows installed HD Audio Codec will not work properly.
I have had a Insperion 530 Core 2 Quad running Windows XP professional 32 bit.  I am interested in installing Windows 7 64 bit and wondered if anyone can tell me if that OS is compatible with the current hardware configuration.  I am running Windows 7 on a newer computer, so all of my software is compatible with 64 bit.  I would appreciate any information or advice on this issue. JR
Insperion 530 Core 2 Quad - Windows 7 64 bit