Digital Signature assistance

Hi I am totally confused as to how to get the digital signature facility into our installation program. I need help from someone with EXPERIENCE in doing this. I plan to use Thawte. To explain what we distribute and how... We have distribute 5 EXE files and 2 x DLL (NT Services) created in VB6. These are all compiled and distibuted as a single EXE installation file using Setup Factory 7. This installation EXE is then downloaded by our customers from our web site. We are finding that many of our installations are failing these days because of Windows security measures (UAC, DEP). I am hoping that by including a verified digital certificate, our customers installations will be easier as it appears that unsigned EXE's seem to automatically be given restricted rights. Please do not waste my time if you really have not had considerable experience of this. I am aware that I will have to purchase from Thawte and get a Private and Public Key as well as providing them with details of our company for verification. I am also aware that I have to download some code signing software from Microsoft (but every single link I have for it, and all my searches, fail to find it!!!) (Autheticode, [login to view URL]). I am also aware that all of this has to be done on MY computer. So, if you know exactly how it works, can step me through it via email/phone then I would be grateful. Andrew