To Reinstall Client Tools SP2 From DVD Without SP2

I am trying in vain to reinstall MS SQL Server(2005 SP2) Management Studio
(on Windows XP Pro SP2) due to.
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2616564&SiteID=1&mode=1

And I have catch-22 (or catch-33) situation trying to reinstall it.

If I try to launch from DVD Z:SQL Server x86Toolssetup .exe from command prompt (cmd):
setup SKUUPGRADE=1
even after deleting (I tried first without deleting)


Microsoft SQL Server Native Client

Microsoft SQL Server 2005 Setup Support Files
in
Add or Remove Programs in Control Panel,

then I end up with
--------------------------------------
Name: Microsoft SQL Server 2005 Tools
Reason: Your upgrade is blocked. For more information about upgrade support, see the "Version and Edition Upgrades" and "Hardware and Software Requirements" topics in SQL Server 2005 Setup Help or SQL Server 2005 Books Online.

Build version check:
Your upgrade is blocked because the existing component is a later version than the version you are trying to upgrade to. To modify an existing SQL Server component, go to Add or Remove Programs in Control Panel, select the component you would like to modify, and then click Change/Remove
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and then

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TITLE: Microsoft SQL Server Setup
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None of the selected features can be installed or upgraded. Setup cannot proceed since no effective change is being made to the machine. To continue, click Back and then select features to install. To exit SQL Server Setup, click Cancel.

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft+SQL+Server&ProdVer=9.00.1399.06&EvtSrc=setup.rll&EvtID=SQLSetup90&EvtType=28108

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BUTTONS:

OK
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How should I reinstall client Tools?
Might be to merge original SS2005 DVD with downloaded SP2?