What is your GFX card?
When you download drivers from a manufacturer website, it install it's own GX control panel which can allow you to set zoom functions etc.
OS
NVM, saw your 'System Specs'

When you right-click the desktop do you have 'nVidia Control Panel' as 1 of the options? If so then select 'Adjust screen size and position' from within NCP and see what options are available.
OS
My Computer
- Computer Manufacturer/Model Number
- Compaq Desktop
- OS
- Windows 7 Ultimate x64
- CPU
- AMD Sempron Dual Core
- Memory
- 3GB
- Graphics Card(s)
- NVIDIA GeForce 6150SE nForce 430
- Screen Resolution
- 1024x768
- Hard Drives
- 150GB Sata