Cannot view DWG files in SharePoint

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Hi,

I have a problem in viewing AutoCAD DWG files in MS SharePoint (WSS). I'm using AutoCAD 2007, Windows XP and IE 6.0. Some computer can work, but some others cannot. SharePoint is just a place to keep documents such as MS Office, PDF or DWG.

There was few times I solve this problem in few computers. What happened is that when I double-click on DWG file, it prompts me white blank page. What I did to solve is that I log out and log in as local admin. Then I double click on AutoCAD icon and wait until it open perfectly.
Log out and login as normal user, go to Sharepoint and launch DWG file. It works fine for that PC only. But when I try to do the same to other computers, they won't work. What's wrong with me?
Will appreciate whoever can share some thoughts..Thanks