I am trying to create a manager for my autostarts. It should read an XML file and then start my programs with a custom delay. For example:
Clearly you are using a 64-bit version of Windows. The c:\windows\system32 and c:\program files directories are subject to a feature called "file system redirection". It is an appcompat feature, it helps to ensure that 32-bit processes don't try to use 64-bit executables. They'll get redirected to c:\windows\syswow64 and c:\program files (x86).
So when you try to start a file in c:\program files\realtek\etcetera, your 32-bit program will be redirected to c:\program files (x86)\realtek\etcetera. A directory that doesn't exist, kaboom. Same ingredient for igfxtray.exe
You'll need to change your program's platform target so it can run as a native 64-bit process and avoid the redirection problem you now have. Project + Properties, Build tab, change the "Platform target" setting to AnyCPU.