After installing sapgui, install vs. Net again.

Install sapgui6.2 first, and then install vs.net 2003. The prompt is as follows:
Setup cannot access the required initialization file 'd: \ progra ~ 1 \ sap \
Frontend \ sapgui \ file \ ODBC \ auncher = "D: \ temp \
This is because, when Windows is running the setup.exeon the CD, the current is the setup.exe under the system32directory.

The solution is as follows: Open the registry and find the following key value HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ app paths \ setup.exe to clear the value of the default key value, then run vs.net 2003 to install the SDK.