Dear All. Now i am run vista business x86 work fine with slic bios mod. But I want to used vista business x64 because i need to upgrade more memory to my system "8 GB" i know vista x86 limit to used memory = 3GB+ My Question 1. Vista x86,x64 is used same slic 2. Vista x86,x64 is used same OEM SLP Key 3. Vista x86,64 is used same cert .XRM-MS file 4. Vista x86,x64 is used same off-line activate process Best Regard.