1. Logon to the Windows 2000, or 2003 server machine as an Administrator.
2. Create a shared directory on the server with read-only access for Everyone (e.g.\\MyServer\FlowolInstaller).
3. Download the MSI file and save it to this shared directory.

Then (without the Group Policy Management Console):
4. Click Start, Programs, Administrative Tools, Active Directory Users and Computers.
5. Right-click the organizational unit to which you want to apply the package, and then click Properties.
6. Click the Group Policy tab.
7. If you have an existing group policy, skip to step 7. If you need to create
a group policy, click New, type a descriptive name for the group policy, and then press ENTER.
8. Click the group policy, and then click Edit.

Or (with the Group Policy Management Console):
4. Click Start, Programs, Administrative Tools, Group Policy Management.
5. Expand the Forest and Domains tree nodes to show the domain node of your domain.
6. Click on the domain.
7. If you have an existing group policy, skip to step 7. If you need to create a group policy, right click the domain and choose Create and Link a GPO
Here..., type a descriptive name for the group policy object, and then press ENTER.
8. In the right hand pane, right click the group policy object and choose Edit....

And Finally:
9. To deploy with a computer-based policy, double-click the Computer Configuration branch to expand it, double-click Software Settings, right-click Software installation, point to New, and then click Package...
10. Browse to the network share (e.g. \\MyServer\FlowolInstaller) that and choose the MSI file, and then click Open.
11. When asked which deployment method to use, choose Assigned and then OK.
12. When your workstations are next restarted, the software will be automatically installed on each one over the network.