It looks like there are some issues with IceChat 7.70 and Windows 8.
I am not sure if these will able to be fixed, but one of the main issues is it can not properly get the data folder in places in the app, and it comes up with errors as a result.
There "may" be an update for this in the future, but no guarantees. I would strongly suggest moving to IceChat 9 , as it has no issues with Windows 8 at all, because it is built with a much more modern compiler.
The IceChat 7 compiler is nearly 15 yrs old, and so it is terribly outdated. It may simply not be meant to run in Windows 8.