As seavixen32 said above, it depends on what your previous OS was. However, your previous OS version is 32bit so the x86 OS should be the right ISO for you to download.
My Computer
- Computer Manufacturer/Model Number
- Custom Build
- OS
- Windows 7 Ultimate x64/Windows 8 Consumer Preview x64/Ubuntu 11.04
- CPU
- Intel Pentium Dual Core E6700 3.2GHz
- Motherboard
- ASUS P5G41T-M LX
- Memory
- Strontium 8192MB DDR3 1333Mhz
- Graphics Card(s)
- msi GeForce N560GTX-M2D1GD5 1GB
- Sound Card
- Realtek HD Audio
- Monitor(s) Displays
- CHIMEI CMV 221D 22"
- Screen Resolution
- 1680x1050
- Hard Drives
- Seagate Barracuda LP Green 3.5'' 2TB Internal HDD 5900RPM + WD Elements Desktop 1TB External HDD 7200RPM
- PSU
- SHAW Viper-1500w Gaming PSU
- Case
- Black eMaxx ATX Mini Tower Case
- Keyboard
- Microsoft Wireless Keyboard 1000
- Mouse
- Microsoft Wireless Optical Mouse 2000
- Internet Speed
- 100GB @ 4.76Mbps