Mathematics tools

Working with Linux +Apahce
PHP=4.3.11
PERL=5.8.4
MYSQL=4.0.24-standard
Moodle v1.4.4
I loaded the moodle with fantastico running under cpanel build 10.1.0-CURRENT 7. Intially the tex and algebra filte worked. However, after some time the following errors has started showing up. Eventhough similar problems are already posted here, i could not solve this problem. The command line response on debug shows the following errors:

Notice: Undefined variable: status in /home/venkates/public_html/course/filter/tex/texdebug.php on line 129

Warning: system() has been disabled for security reasons in /home/venkates/public_html/course/filter/tex/texdebug.php on line 129

Warning: shell_exec() has been disabled for security reasons in /home/venkates/public_html/course/filter/tex/texdebug.php on line 143


Notice: Undefined variable: status in /home/venkates/public_html/course/filter/tex/texdebug.php on line 144
The shell command
"/home/venkates/public_html/course/filter/tex/mimetex.linux" -e "/home/venkates/public_html/course/uploaddata/filter/tex/74c2b66b2d2501b77fad711fd1febcf0.gif" '\Large f(x)=\Bigint_{-\infty}^x~e^{-t^2}dt'
returned status =

Notice: Undefined variable: status in /home/venkates/public_html/course/filter/tex/texdebug.php on line 145

Notice: Undefined variable: status in /home/venkates/public_html/course/filter/tex/texdebug.php on line 147

Notice: Undefined variable: status in /home/venkates/public_html/course/filter/tex/texdebug.php on line 149
File size of mimetex executable /home/venkates/public_html/course/filter/tex/mimetex.linux is 760158
The file permissions are: 100775
The md5 checksum of the file is 06b8db764f0eded2edbbad09a716fa40
Image not found!

The algebra filter showed the following error:
Warning: shell_exec() has been disabled for security reasons in /home/venkates/public_html/course/filter/algebra/filter.php on line 163