You need something simply called Adobe Acrobat rather than Adobe Acrobat Reader which is what most people have.
The full version of Acrobat isn't cheap - about £250 I think.
Alternatives are...
1) Adobe used to have a trial PDF conversion utility on their website. You uploaded a file and they converted it for you. There were size limits though and I can't seem to find the site anymore.
2) Find someone who has the program to convert a document for you - if you can attach the file to an email (i.e. it's not huge) then I don't mind converting it for you.