If the message you are getting is specifically, "These scripts do not support this Skype version," let me know what operations result in this message. There are ten points in the code that can cause that message. Most have to
do with handling chat messages and windows, but there may be other operations that trigger this message.

It would also help me to know when you last downloaded a Skype 7 update.

Finally, because one known cause of this issue is related to Windows MSAA support, two more questions: Have you rebooted since you ran into this problem, and have you recently installed or removed something called Mathplayer?