team foundation server 2008 AND project server 2007 installation e

[HAKINEN]

Hi,
I have a problem. I could not find an answer however make a big search in
the web. And I decided to ask this problem to the experts of this issue..
I installed teamserver to my windows server2003(updated)(With the guide of
installation-step by step-) And it has succeeded..
Then I Wanted to install project server 2007 too. But I could not.
When Installing ProjectServer 2007, Installation is OK. When it has finished
a screen which has "configuring sharepoint" checkbox" AndI checked it, OK.
And I encountered this error here (In the error log file) :

"
An exception of type
Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException
was thrown. Additional exception information: Failed to upgrade SharePoint
Products and Technologies.
Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException:
Exception of type
\'Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException\' was thrown.
at Microsoft.SharePoint.PostSetupConfiguration.UpgradeTask.Run()
at Microsoft.SharePoint.PostSetupConfiguration.TaskThread.ExecuteTask()"

I have tried this(all installation steps -beginning from sqlserver to the
teamserver and project server-) 3 times..

So Could't I install "team foundationserver 2008" AND "project server 2007"
to the same server (single server: application and data tier is in this) ?
Or what can I do for it?

I think the problem is: as you know team server configures the sharepoint
and project server also wants to do that.. And they are in war : )


Please help me..!