Can't activate Windows 7 Professional Online?

When i'm trying to activate my Windows 7 Professional in online i've got error like this -

A problem occurred when Windows tried to activate. Error code 0x8007007B. For a possible resolution, click MoreInformation.

Contact your system administrator or technial support department for assistance.

More Information - 

The following information was found for this error :

code : 
  0x8007007B

Description :
   The filename, directory name, or volume lable syntax is incorrect.

What can i do for this? My another pc didn't raise this error. It's activated perfectly.

If you are having problems activating online you can simply telephone Microsoft and activate over the phone.