Depending if your windows 8 tablet has an ARM processor (type
found on phones) or a X86 Processor (think of it as a normal
processor)
You can't transfer per say, transfer Windows 7 from your laptop
- if it's a x86 processor, you can install windows 7 from an image
- dvd , then key in the CD key - but please note, if you got your
laptop with windows 7 preinstalled , the cd key found on the label
at the base, will not work. However if you bought the windows 7
installation disc and installed in your laptop, then yes you are
able to then transfer it to your tablet.
Take note though, Windows 7 is not optimised for touch - drivers
and operating software wise.
It's advisible not to do so.