Why won't adobe Reader 7 open up forms I create in Pro 8 & livecycle?

Hi, I have done everything and created an online form but when I distribute it to other people, unless they have Professional 8, they can't open it, reader won't open it. Can I run through what I did and tell me what I am doing wrong:-
I created the pdf from word, then in Acrobat Pro 8, I went to ‘Forms’ > create new form> start with an electronic document, continue and next next, run form field recognition, done, which then brought me up in livecycle designer which allowed me to add email button, web links etc. Saved the form to my desktop
Then I opened the form up in Acrobat 8 again to distribute it, so in Forms>distribute form>
Send now via email, enter the email, collect the data in an area, desktop etc, then hit next. Enter emails required, then hit done.

But when the person within our organisation trys to open it, it will open up in their reader 7 but it won't allow you to submit or open the web links or anything. Numerous pop ups appear also, like operation is not permitted, fault occured, this pdf form requires a newer version of Adobe Reader, but everybody in here has version 7???? and I have enabled the usage rights? Does anybody know what the problem could be as I can't think of where I am going wrong or what the problem may be. Really need help with this as I can't expect the entire organisation and external users to all get acrobat writer?