SNAP doesn’t use the registry.
I assume that you have somewhere a link (maybe on the desktop) which is named IITB_Soft and this links to some software on your external hard drive.
This is an issue in Java. There are several similar problems reported.
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8213583
Eventhough it is said that it is fixed for version 8u202 (which we use with SNAP 7), there might be some other issues open which cause the problem.