ODBC connect VB - Oracle 7

I'm trying to connect to an Oracle 7 database with VB, I used the following code in my form Load procedure
The OraLink DSN is a System DSN I've got in Win98

Set mCon = New ADODB.Connection

'sConnStr = "DSN=OraLink;UID=pkdb726;PWD=pkdb726;"
'sConnStr = "UID=pkdb726;PWD=pkdb726;DRIVER={Oracle ODBC

Driver};SERVER=spooky;"


    'sConnStr = "Provider=MSDAORA.1;UserID=pkdb726;DataSource=spooky;Persist


Security Info = False;"

'sConnStr = "ODBC;DATABASE=pkdb726;UID=pkdb726;PWD=pkdb726;DSN=OraLink;"

sConnStr = "DSN=OraLink;DBQ=spooky;UID=pkdb726;PWD=pkdb726;"

mCon.Provider = "MSDAORA.1"

mCon.Open sConnStr

I get this error:

ORA-12203 : TNS : Unable to connect to destination

• - Direction or suggestions would be appreciated