Virtual Server 2005 R2 can run on hosts with x86 - 64 processors .
It can not run x64 guests that require x86 - 64 processors ( guests can not be 64 - bit ) .
Although Virtual Server 2005 R2 can run on hosts with x86 - 64 processors , it can not run x64 guests that require x86 - 64 processors ( guests can not be 64 - bit ) .