You may not know that the Dell license does not give you the rights to move it to another machine. Some thought they "bought" Vista, XP, Windows when they buy a laptop or other common maker's machine. In many cases you get the stripped down OEM license.
Go ahead and try but no one can offer any support and it should fail if the OEM did they job right.
Again, this is all about understanding licenses. It's tough on those that first explore this area and many get upset over it.
We wish to put a larger hard disk in my son's non Dell laptop. We are aware we could use a cloning program to transfer the data between disks but would like to achieve a clean install. We have the COA sticker / number for the original installation on the laptop but no an install disk and the backup section on the present hard disk is corrupted.Will we be able to use my Dell operating system disk (supplied for my Dell Inspiron 1520 laptop and containing the Vista operating system) and his legitimate COA registration numbers to achieve an installation or will we find the ourselves unable to follow this path through Dell or other customisations?