Ok,found my mistake, so now I have the code like this:
Select Top 1000000 tblComputers.Computername, tblComputers.ComputerUnique, tblComputers.Domain, tblADComputers.OU, tblSoftware.softwareName, tblSoftware.softwareVersion From tblComputers Inner Join tblADComputers On tblComputers.Computername = tblADComputers.Computername Inner Join tblSoftware On tblComputers.Computername = tblSoftware.ComputerName Where tblADComputers.OU = 'OU=Computers,OU=blah,OU=AMER,DC=blahblah,DC=com'
I saved it just fine, but when I try to see the output I get nothing.