Can anyone help me to find a software to track files and folders access/modification on a server using Windows 2003?

Have use the builtin default auditing tool? Auditing is enabled using Group Policy, at the site, domain, organizational unit (OU), or local computer level. You will find the audit policy settings in:

Computer Configuration\Windows Settings\Security Settings\Local Policies\Audit Policy

For more Information about Audit Policy Visit Microsoft Technet

yes but i want the information to be more in details. infact serveral users are connected to the server over the network. the problem is that sometimes files or folders are being misplaced or deleted. i wanted to have a log on these with the staffs name as we are using active directory. thanks

It is very difficult to find specific events for directory service access because of the large volume of (generally innocuous) events that take place. For this reason, the Member Server and Domain Controller Baseline Policies only audit failed events for directory service access. This configuration will help you identify when an attacker attempts unauthorized access to Active Directory.

Attempted directory access will show as a directory service event with the ID 565 in the security log. Only by looking at the details of the security event can you determine which object the event corresponds to.

Is there any third party software that can be used?