got the same bug in Windows 7

using Windows Powershell I get "The set command specified is not valid."
using CMD it works

remember to run as administrator

PS C:\Windows\system32> bcdedit /set {current} description "Windows 7 64bit"
The set command specified is not valid.
Run "bcdedit /?" for command line assistance.
The parameter is incorrect.

C:\Windows\system32>bcdedit /set {current} description "Windows 7 64bit"
The operation completed successfully.