TL-WN321G / Wireless Network Connection Won't Enable

I just bought TP-LINK Wireless USB Adapter (Model: TL-WN321G) and had followed all necessary procedures (both manual and automatic) to install the driver specifically in my Windows 7 (32-Bit) desktop computer but every time I installed the driver it shows that in my Network Connection there is the "Wireless Network Connection 2" - Disabled. However, when I right click into it and try to Enable, it shows that it is now Enabling.... then Enabled but after that my "Wireless Network Connection 2" still Disabled.I had already uninstalled my AVG Internet Security 2012 and disabled Windows Firewall and Run in Safe-Mode in installing the driver but still no luck it keeps showing that my "Wireless Network Connection 2" still Disabled after trying to Enable it.

OS Version: Microsoft Windows 7 Ultimate, 32 bit
Processor: Pentium(R) Dual-Core CPU E5800 @ 3.20GHz, x64 Family 6 Model 23 Stepping 10
Processor Count: 2
RAM: 2047 Mb
Graphics Card: NVIDIA GeForce 8400 GS, 512 Mb
Hard Drives: C: Total - 149898 MB, Free - 97783 MB; D: Total - 155243 MB, Free - 153745 MB;
Motherboard: ASRock, G41C-VS
Antivirus: None