missing files

[neecee]

I am missing all files in the application window..mwundel, mwsmrtmon, etc. Where do I go to put these back in? Also I am unable to expand anything. Every time I try to do this I get can't open input file. I have no memaker or chkdsk or scandsk when I try to open these from the dos prompt I get bad command or file name. Help me please! my nerves are frazzled!