Sorry to hear you have had computer issues.
Crashing to desktop can occur under certain circumstances but we have no other reports of Character Creator causing these kind of serious issues. Unfortunately it seems likely you have other hardware problems that need looking at. For example, if your computer has an overheating issue with the CPU or GPU or faulty memory, then this is more likely to come to light when using software like CC4 which makes heavy use of your system resources, rather than when doing light work like browsing the internet or reading emails.
Under the circumstances It would be wise to get your computer checked out by a professional where they should be able to find the cause of the problem.
Peter
Forum Administrator
www.reallusion.com