Hello all, I hope that someone can help. I have trolled these boards for the last 3 days and from what I have read, my issues don't look like they can be resolved. I inherited a MacPro 1.1 with 2 Dual Core Zenon 2.6 processors and 10Gig of memory. The reason I was looking forward to getting this computer was as a replacement to my older P4 running Windows XP Pro. Here is my problem. As best as I can see the Xenons are 64-bit chips. Even in the app info on the Mac, the apps show as 64-bit apps. When I try to install Windows 7 64 bit I am told, that it is incompatible. So, I try to install Boot Camp, Windows XP Pro. It installs fine but max memory available is only 1.9 Gig. I scratch my head because there is not reason it should not read 3.0+. My PC at home has 4 Gig it reads 3.12. My Macbook Pro reads more than 3.0. My other PC at work (same XP) reads more than 3.0. Can someone help? I need to fix this or I just wasted a lot of time and money on a computer that won't suit my purposes. Everything I have read seems to indicate 1.9Gig is the max the MacPro will read in XP. That makes no sense. Thanks in advance for your help. A PS. It looks like my Dual Core Xenon MP 1.1 system is on the exclusion list. Does that mean I am screwed? I hope not.