sorry, I have moved this post to azana24x7.INSTALLING OMNET Make sure you have installed it correctly. How do you know that it is installed correctly? Here are few points to check:b. The samples simulations in the samples directory. Check whether these samples can be run. How? Here is the example for tictoc sample for version omnetpp-3.2p1-src (works on windows xp and visual c++ 2005 professional).C:\omnetpp>cd samplesC:\omnetpp\samples>cd tictocC:\omnetpp\samples\tictoc>tictocOMNeT++/OMNEST Discrete Event Simulation (C) 1992-2005 Andras VargaRelease: omnetpp-3.2, edition: Academic Public License.See the license for distribution terms and warranty disclaimerSetting up Tkenv...Loading NED file: C:\omnetpp\samples\tictoc\tictoc1.nedWarning: replacing existing declaration for simple module type `Txc1'Warning: replacing existing declaration for compound module type `Tictoc1'Warning: replacing existing declaration for network `tictoc1'Loading bitmaps from .\bitmaps: *: 0Loading bitmaps from C:\omnetpp\bitmaps: *: 0 abstract/*: 72 block/*: 256 device/*: 156 misc/*: 56 msg/*: 20 old/*: 111 status/*: 17Plugin path: ./pluginsDBG: layout done in 0 secs, 38 iterations (0 sec/iter)End run of OMNeT++c. Materials from the omnet community.d. As for omnet with visual c++, you have to make sure that folder msvc exits and you did not receive any msvc error during omnet installation.Below are some usefull link on OMNET++