How to install x86 software on 64 bit system

What software are you trying to install ? I have never seen Windows Vista or Windows 7 / 64 throw up an error like this.

I've had it on a few different installations.

This was the DSA Driving theory practice CD

If you get an error like that on Win 7 64 bit, you would most likely still get the same error if it was 32 bit. This is an error probably from the DSA installer, not windows, as the installation program probably does not recognize Windows 7. Contact the manufacturer of the program and see if they have a work around. Most of the DSA practice tests can be done online as well.

i have that problem with lots of software on windows vista home premium x64...

Have you tried running the installation in XPsp2 mode?

yeah compatibily MODE!!!

I haven't done a lot with 64 bit OS. But I do remember something about 16 bit programs not working with them and 32 bit programs that use 16 bit installers not installing.

Looks like the installer more then anything else...probably an old 16-bit installer, which will not work under Vista/7, period.

If you are trying to install a copied version of DSA it wont work because not all software is in the files plus they are riddled file tracking cookies id suggested different download and virus check before installing