I have Windows 10 (64-bit) installed on my 64-bit system. Now, can I run Windows 7 (32-bit) along with it without causing any kind of trouble ???

Thanks so much,I have solved it

Thanks, could you tell me more details?

Thanks you,my happened in B.
I bought a new pc with no OS installed, installed Win 10, and programs I installed since then don't run.I don't know why.I have test install the program in other pc...

I have buy a new computer last week,I have installed windows 10,but I found many programs couldn't open.why?

I have use simple way of use the partition wizard cloning my hard drive in windows.