[TYPO3-linux] many errors in the install tool 4.0

[SnowKid]

Hi all,

I'm trying to install TYPO3 4.0 on a linux server. I followed all the 
instructions, set chmod 777 to all possible files and directories, however 
when I enter install tool I get lots of error meassages plus I can't change 
password for the install toll. Needless to say that install tool crashes and 
doesn't go further...

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 240

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 241

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 242

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 243

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 244

Warning: Cannot modify header information - headers already sent by (output 
started at /home/XXXX/public_html/typo3_src-4.0/typo3/install/index.php:1) 
in 
/home/XXXX/public_html/typo3_src-4.0/typo3/sysext/install/mod/class.tx_install.php 
on line 284