Where do I get the patch to run mass effect 1 on windows 7 64 bit please ?

Please follow Kepha's guide:

http://social.bioware.com/forum/1/topic/131/index/1335293/1

The "guide" is a link to the 1.02 patch. 

Needed for BDtS DLC.

Not needed for Win7 or Win8, (32-, or 64-bit.)

Just install the latest patch.

Mass Effect is supposed to run on Windows 7 64-bit. I've been using that OS for a long time now and never had any issues with Mass Effect.

I have installed and played Mass Effect, Mass Effect 2, and Mass Effect 3 on both Windows 7/64-bit, (retail-disc install) and Windows 8/64-bit (EA/Origin Store digital download) with no problem.

I did install the 1.02 patch before getting BDtS, but the basic game ran fine on both platforms.