Echelon Enterprise Service Failure

I have been running EES4 on a laptop running Win7 pro but recently the Enterprise service has failed and reports the following error. "LnsNativeUtil.dll appears to be corrupted. Please install the i.LON Smartserver Enterprise Service again. An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)". I have tried uninstalling and reinstalling the Enterprise Service SR2 but still get the same message. Any help would be appreciated.