General instructions here:
How to Remove iMesh | eHow.com
That second one includes going in a stopping the running processes, because imesh installs things to run in background, and you can just uninstall a running process.
But if you can provide a browser, there may be some things specific to that browser.
You can also try a malware removal tool, like:
Malwarebytes Anti-Malware - Download.com
All of this assumes that it's a fairly benign installation and that something worse hasn't been invited aboard.