When trying to view the web reports using Oracle I always get the

System error 5 translates to "Access Denied", and you are getting this error because the NTFS permissions in the Oracle installation directory are setup incorrectly by the Oracle installer. Oracle 9.2 Client software requires that you give the Authenticated User privilege to the Oracle Home by following these steps:

Log on to Windows as a user with Administrator privileges.
Launch Windows Explorer from the Start Menu and and navigate to the ORACLE_HOME folder. This is typically the "Ora92" folder under the "Oracle" folder (i.e. D:\Oracle\Ora92).
Right-click on the ORACLE_HOME folder and choose the "Properties" option from the drop down list. A "Properties" window should appear.
Click on the "Security" tab of the "Properties" window.
Click on "Authenticated Users" item in the "Name" list (on Windows XP the "Name" list is called "Group or user names").
Uncheck the "Read and Execute" box in the "Permissions" list under the "Allow" column (on Windows XP the "Permissions" list is called "Permissions for Authenticated Users").
Re-check the "Read and Execute" box under the "Allow" column (this is the box you just unchecked).
Click the "Advanced" button and in the "Permission Entries" list make sure you see the "Authenticated Users" listed there with:

Permission = Read & Execute

Apply To = This folder, subfolders and files

If this is NOT the case, edit that line and make sure the "Apply onto" drop-down box is set to "This folder, subfolders and files". This should already be set properly but it is important that you verify this.

Click the "Ok" button until you close out all of the security properties windows. The cursor may present the hour glass for a few seconds as it applies the permissions you just changed to all subfolders and files.
Reboot your computer to assure that these changes have taken effect.

Re-execute the application and it should now work.