I also have had this exact problem. I just downloaded Construct this week, version 0.99.62, and was able to run the program fine until today, where I got the same error:
Microsoft.VC80.MFC,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50727.4053"
The only thing I had changed was a couple updates through Windows, such as an IE update, a security update, and a driver for a Microsoft mouse. I am running Windows 7 by the way. I have been trying to figure out what is wrong, and have run the sxstrace.exe and can post the results. I could sure use some help as I would love to get back to Contructing.
Thanks. And let me know if there is any extra info you require.