"C:\WINDOWS\system32\cmd.exe" /c "C:\WINDOWS\system32\runnas.exe" /user:rds\xxxxx "\\RDSJNBPEN2\netlogon\bginfo\bginfo.exe" "\\RDSJNBPEN2\netlogon\bginfo\rds.bgi" /nolicprompt /silent /timer:0 /password:xxxx /env
Ok, so you can see that all you environment variables have expanded, so your %COMSPEC% is fine.
Check that the other values/paths are correct, and if they are you are going to need to start breaking the process down to find which bit is failing.
