Hi,
The library file lib.so ld.o may have been deleted or corrupted.So when u run the command ps or w which depend upon this library,u get an error.If u have another server then search for this file on that and copy it(ftp it to this server ) to the path as reported in the error or if u have a backup then restore it from that.
If u have any doubts the reply to this....
I hope this is helpful to u....