Error Code: -2147221000 (DLL for class not found)
I only know of one fix for this error code...
To fix this Error, just go into the link i provide then download and install the update from Microsoft. What this does is it updates the .Net Framework which is a requirement for Maplestory to run...
Also, the reason you may be getting this Error has to do with C++. Either: Class is not updated, Class is corrupted/damaged, Class is missing, or Class is infected.
Simple Solution:
For 32bit Operating Systems, go
HEREFor 64bit Operating Systems, go
HERE+Rep if this helped =]