Deleted Inetpub log files on Exchange Server

Hello guys,

One of clients I help sometimes happened to delete the W3SVC1 & W3SVC2 log files in order to create space on the C drive. Since then, the status of the databases are now unknown and half the services are not started. The event log is filled with MSExchange RBAC 23 & 258 events. 

I am now trying to update to the CU20, but I stuck with this error:

Error:
The following error was generated when "$error.Clear();
            $aspnet = [System.Runtime.InteropServices.RuntimeEnvironment]::GetRunTimeDirectory() + "aspnet_regiis.exe";
            Start-SetupProcess -name "$aspnet" -args "-ir -enable"
        " was run: "System.ComponentModel.Win32Exception (0x80004005): The specified executable is not a valid application for this OS platform.
   at Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl)
   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target)
   at Microsoft.Exchange.Management.Tasks.RunProcessBase.InternalProcessRecord()
   at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()
   at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".

There is much information about this error that I have seen.