Software Installation through group policy

Hi,

We have a mixture of Windows 2000 and 2003 servers and we’re trying to roll out software through group policy. For some reason, it only work if I assign or publish the software to the user. It will not work if I assign the software to the computer machine itself. I get the following events in the application log: 102, 108 and 1085. Am I doing something wrong? Where should I check to correct this problem? Thanks!