Sorry, my mistake, but that doesn't cause the error anyway, so here's the query I use :
SELECT dbo.tblComputerSystemProduct.Vendor, dbo.tblComputers.Computername, dbo.tblComputers.Domain, dbo.tblADComputers.OU, dbo.tblADComputers.Lastchanged
FROM dbo.tblADComputers INNER JOIN
dbo.tblComputers ON dbo.tblADComputers.Computername = dbo.tblComputers.Computername
WHERE (dbo.tblADComputers.OU = 'My OU')
So when I run this (of course I fill in the correct OU), I get the error :
The multi-part identifier "dbo.tblComputerSystemProduct.Vendor" could not be bound.