some programs don't start after some time the windows is logged on

[pooreal]

Hello
I have windows 7 ultimate 64-bit on an ASUS k45-vd laptop.
there were no problems, until about a week that when I log in to windows, everything works well, but after sometime some programs don't start!

LIKE: Calculator (from startmenu) => gives error: The item you selected is unavailable. It might have been moved...

OR: windows wifi troubleshoot => windows cannot find '%windows%\system32\msdt.exe' make sure you typed the name correctly and try again.

CINEMA 4D => The program can't start because libmmd.dll missing from your computer!

as I said before, there is no problem when I just log in, but after a while the problems show up.

The latest programs I installed: AfterEffects CC, Visual Studio 2015, CINEMA 4D R16

Thanks for your help

 

[GokAy]

Try a System Restore to a prior date the issue started - http://www.sevenforums.com/tutorials/700-system-restore.html
You can also try a clean startup - http://www.sevenforums.com/tutorial...ation-conflicts-performing-clean-startup.html

 

[pooreal]

thanks @GokAy, I just did clean startup, I'm waiting to see if the problems occur