Thanks for your input, I think this looks better:
Select tblComputers.Computer, tblComputers.Domain, tblCPlogoninfo.logontime,
tblCPlogoninfo.Username, tblCPlogoninfo.Ipaddress
From tblComputers Inner Join
tblCPlogoninfo On tblComputers.Computername = tblCPlogoninfo.Computername
Where tblCPlogoninfo.Username = 'Administrator'
Order By tblCPlogoninfo.logontime Desc
Just posting this as it might be useful for other people as well.
Thanks!