Extremely Slow Queries

Im doing this program for a post office and stuff, their DB is Oracle and they want to front end it in Access coz its free or bundled w/ office.

Im using the almost fossilized Access 2000, the laptop Im working on is a2.6 ghz Centrino w/ 1024 MB DDR RAM abd 250 GB HD.

Now, since that I am sure that the machine's specs has nothing to do with it, I want to ask why are my queries so slow?

I have 15 tables each w/ almot 20K records.

So when I query something like this.
SELECT KYOKUSYOCD AS 局所コード, BUNSITUCD AS 分室コード, REREKINO AS 履歴番号, TOKUISAKICD AS 得意先コード, TRIKAMCD AS 取扱科目コード, '得意先局所対応マスタTTOKUKMD01 の局所コード = ' & KYOKUSYOCD & ' と分室コード = ' & BUNSITUCD & ' のペアが、局所マスタTKYOKUMD01 の局所コードと分室コードとして存在していません。' AS エラー内容 FROM TTOKUKMD01 WHERE KYOKUSYOCD & BUNSITUCD NOT IN (SELECT KYOKUSYOCD & BUNSITUCD FROM TKYOKUMD01)

UNION ALL

SELECT KYOKUSYOCD, BUNSITUCD, REREKINO, TOKUISAKICD, TRIKAMCD,'得意先局所対応マスタTTOKUKMD01 の得意先コード = ' & TOKUISAKICD &' が、得意先マスタTTOKUIMD01 の得意先コードとして存在していません。' AS WHATERROR FROM TTOKUKMD01 WHERE TOKUISAKICD NOT IN (SELECT TOKUISAKICD FROM TTOKUIMD01)

UNION ALL

SELECT KYOKUSYOCD, BUNSITUCD, REREKINO, TOKUISAKICD, TRIKAMCD, '得意先局所対応マスタTTOKUKMD01 の得意先コード = ' & TOKUISAKICD & ' が、得意先マスタTTOKUIMD01 の得意先コードとして存在していません。' AS WHATERROR FROM TTOKUKMD01 WHERE TOKUISAKICD NOT IN (SELECT TOKUISITENCD FROM TTORIKMD01)

UNION ALL SELECT KYOKUSYOCD, BUNSITUCD, REREKINO, TOKUISAKICD, TRIKAMCD, '得意先局所対応マスタTTOKUKMD01 の取扱科目コード= ' & TRIKAMCD & ' が、取扱科目マスタTTORIKMD01 の取扱科目コードとして存在していません。' AS WHATERROR FROM TTOKUKMD01 WHERE TRIKAMCD NOT IN (SELECT TRIKAMCD FROM TTORIKMD01);


Its soooooo slow, as in 6 minutes loading slow, windows xp running on pentium 2 slow, very very... ok you guys get it already.

Please help me coz Im losing my mind already. I did one version in SQL Server and it worked just fine. Sad thing is, they lvoe their VBA apps coz it can be like engraved in Excel or something. Anyway please help