I have tested it in WinXp, those are the steps:
1. Create a diferent user from admin, but with administration permissions
2. Install Java 1.6
3. Install ScadaBR 1.0
4. Install MatrikonOPCSimulation
5. Disable Firewall
6. Look for "Use simple file sharing (Recommended)" and DISABLE this option in 'Folder options'
8. Create OPC DA using previous user and password
now I am testing in win7.