Your Vista is 32bit, is the Windows 7 32bit also?
Do you have the Storage Controller drivers?
You need to add them during the install.
Do you have an OEM or Custom build computer?
Check steps 7&8 in the Clean Install Windows 7
tutorial for where to install drivers from.
Is your internet connected during the install?
You can check the Tutorial quick reference list for Installing Windows 7
for more tutorials, and programs to get the info for the system specs. Please fill them out with as much detail as possible, this will help us to give suggestions.