I uninstalled 3CX 2.0 o try install 3.0. I can`t install both now. The 2.0 has a error: "Error writing file 3CXSetupUtils.dll" and stops. The 3.0 has the error: "Error writing fiel d:\...\CONFIG~1\Temp\nsr29.tmp\ztInfoPlugin.dll" and stops. Now, I can`t install both versions. I use WIN2000. I don`t make any change in the PC.