i want to upgrade windows 7 ultimate 32 bit to 64 bit for gaming coz the system requirements for the great gaming is only using 64 bit, but i can't solve it. i have already installed windows 7 ultimate 64 bit ISO but after i clicked the setup.exe, the box appeared and it was written "the version of this files is not compatible with the version of windows you're running. Check your computer system to see whether you need an x86 (32 bit) or x64 (64 bit) version of the program, and then contact the software publisher." I have no choice but to post this. please answer ASAP. your answer will be very welcome 
My Computer
At a glance
Windows 7 Ultimate x64Core 2 Duo E77003 GBNVIDIA GTX 560 TI
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- BenQ
- OS
- Windows 7 Ultimate x64
- CPU
- Core 2 Duo E7700
- Motherboard
- ASUS
- Memory
- 3 GB
- Graphics Card(s)
- NVIDIA GTX 560 TI
- Hard Drives
- 300 GB
- Antivirus
- AVIRA
- Browser
- GOOGLE CHROME