TYPO3 Core

I am installing typo3 for the first time and can't work out what the problem is. Everything seems to be OK. Install script reports no errors with DB.

If I then go to the Backend log in page I can't log in. Further the database seems to be working fine. The Install Tool can access the database OK

Existing and running webserver environment:

Win 2000
IIS 5.0 Win32
PHP 4.4.2
MySQL 5.0.

Tried TYPO3 versions:

DummyPackage 3.8.1
QuickStart 3.8.1

and also testsite package. in every case it outputs "Your login attempt did not succeed. Make sure to spell your username and password correctly, including upper/lowercase characters."

but the data is there within the database and I tried out many times to login. only failures. Cookies and javascript is set. They are working. In forum , found that there may be problems with mysql 5. then set the sql-mode = mysql4 , then also it is not working.

It is really frustrating as this case not mentioned in any of the documents downloaded and listed and also are going on and on . Please help , I need this urgently.

(issue imported from #M3790)