In the reportbuilder you need to create a link between the 2 tables (between the "computername" fields")
This should be the correct result:
Select tblFileVersions.Found, tblFileVersions.FilePathfull,
tblComputers.Computername
From tblFileVersions Inner Join
tblComputers On tblFileVersions.Computername = tblComputers.Computername
Where dbo.tblFileVersions.Found = 1 And dbo.tblFileVersions.FilePathfull Like
'%ofcdog.exe'