Win 7 Pro not activating after clean install

Am I not permitted to agree with other posters on here?
 

My Computer My Computer

Computer Manufacturer/Model Number
Dell Dimension c521
OS
Windows 7 Home Premium 64bit
CPU
AMD Athnlon 64 X2 Dual Core 6400+ 3.21GHz
Motherboard
Dell 0HY175
Memory
2 x 1024 DDR-2 Sdram. Crucial Part# CT12864AA667.M8FA.
Graphics Card(s)
NVIDIA GeForce 6150 LE (OnBoard)
Sound Card
N/A
Monitor(s) Displays
Dell E207wfp
Screen Resolution
1680 x 1050 60hz
Hard Drives
Hitachi Deskstar Model HDS728080PLA380
PSU
Dell L280P-01. 280 Watts
Case
Dell desktop/tower.
Cooling
Cpu: Dell Heatsink with 120MM fan. Chipset: ZALMAN ZM-NBF47
Keyboard
Microsoft Natural Ergonomic 4000 v. 1.0
Mouse
Microsoft Wireless mouse 5000
Internet Speed
Cable modem. Motorola sb5101 1megabyte/s
Other Info
I was going to build my own system, naturally, but dell gave me free monitor and a large discount for being a college student :-)
Agree all you want.
 

My Computer My Computer

OS
Windows 7 Enterprise 64-bit
CPU
AMD Phenom II X4 3.0GHz
Motherboard
ASUS M5A97
Memory
8GB G-Skill Ripjaws DDR3 1333
Graphics Card(s)
PNY GeForce 460 GTX 1GB OC - Enthusiast Edition
Sound Card
VIA High Definition Audio
Monitor(s) Displays
Dell 19"
Screen Resolution
1280x1024
Hard Drives
1TB - Primary
160GB - Secondary
250GB - External backup for important files
PSU
OCZ Fata1ty 700W Modular PSU
Case
ASUS
Keyboard
Microsoft Wireless Keyboard 2000
Mouse
Microsoft Wireless Mouse 2000
Internet Speed
3 Mbps/768 kbps
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