After much search on the web i managed to do it.
Delete cledx.exe key from HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Then make a shortcut on desktop to cledx.exe,e.g. ..."C:\Program Files\Syncrosoft\POS\H2O\cledx.exe"
There was a thread on this very forum explaining this but could not get it. Are some posts deleted on this forum?