image prob after install.

Hi To all,
I just install Opencart 1.3.4 and after this installation I've these error in admin.
No image display on admin and some error on displaying image on IE7 &8 and Mozilla 3.5x on the shop. With default too.

Can't you help me.
Here a copy of the error log :
2009-12-29 10:10:07 - PHP Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/myuser/public_html/system/library/image.php on line 43
2009-12-29 10:10:07 - PHP Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/myuser/public_html/system/library/image.php on line 50
2009-12-29 10:12:51 - PHP Warning: imagejpeg(): supplied argument is not a valid Image resource in /home/myuser/public_html/system/library/image.php on line 43
2009-12-29 10:12:51 - PHP Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/myuser/public_html/system/library/image.php on line 50
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 12 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 201
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 38 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 217
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 18 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 233
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 46 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 266
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 32 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 283
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 6 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 318
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 1122 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 334
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 3 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 335
2009-12-29 13:23:51 - PHP Notice: fputs() [<a href='function.fputs'>function.fputs</a>]: send of 6 bytes failed with errno=32 Broken pipe in /home/myuser/public_html/system/library/mail.php on line 351
2009-12-29 13:23:51 - PHP Warning: Cannot modify header information - headers already sent by (output started at /home/myuser/public_html/index.php:67) in /home/myuser/public_html/system/engine
/controller.php on line 22

Any body can Help me.
Didier