Can't create standard user

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Pentium(R) CPU G620 @ 2.60GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 2
RAM: 4002 Mb
Graphics Card: Intel(R) HD Graphics Family, 1809 Mb
Hard Drives: C: Total - 942032 MB, Free - 861358 MB; D: Total - 11733 MB, Free - 1435 MB;
Motherboard: PEGATRON CORPORATION, 2AC2
Antivirus: Norton Internet Security, Updated and Enabled
Can't create Standard user ...............

:mad: