Some additional information.
When the SAPINST is executed it creates a new folder in windows 8 this is under the C:\Users\peter_000\AppData\Local\Temp\ folder. This folder gets a dynamic name like sapinst_exe.7668.1407600607. In this folder is also a version of Java.
Now I made a copy of this folder because at the moment that you exit the SAPINST program this folder gets deleted.
Anyhow after having copied this folder I replaced the filed in the JRE folder with the data from my JRE7 folder.
In this SAPINST folder there is also again the program called SAPINST.
When I now launch this program I get a CMD window that is opened and then the GUI screen is showing. However in this GUI screen SAP is asking for a user and password.
I have tried entering my windows userID and password but that is not accepted.
From the information that I found on SCN or elsewhere I have not seen anyone needing to enter such a password or ID.
Ref blog --> How to install SAP NetWeaver Application Server ABAP 7.03 SP03 Trial – Ready for ABAP in Ecplipse (AiE)
Anyone an idea on how I can get this installed? Can I make the SAPINST program to use my installed java version instead of the version that it extracts itself?