,SteveRichter wrote

If winRT apps are sandboxed that means a PC cannot be malwared thru a winRT app, correct? If so, I think it would be a huge step forward for user's to be able to use their PC without the threat of  malware attacks.

No. WinRT apps could still bring malware, it's just an alternative to the Win32 API set (and you can also still get malware through Win32)