You may know this but I will say it so as to be clear ... generally what in the Start Menu are not "files" in the sense there would be user data, that location would be used for Links (pointers to programs/help files/etc). Basically, it sounds like you have a menu folder called Imagenomic with links under it and you need that in W7 too.
Now the proper folder location hasn't really moved, it is still at c:\Documents and Settings\All Users\Start Menu\Programs\ where you would add Imagenomic, but in W7 this folder is considered a system file and is protected. In Windows Explorer you can adjust the settings to show system folders but you still won't have permissions to write there. What you should do is log on as an Administrator and install the Imagenomic program in W7 using their install routine and hopefully it asks for "current user or all users" and if you pick all users it should create the menu folder for you.
If this doesn't work for you or it doesn't offer the "All User" option on install then you would need to log on as an Administrator and
grant permissions to yourself to write to the folder. The easiest way to grant permissions is with the
Take Ownership script which can be installed and adds a "Take Ownership" option to the Windows Explorer right-click context menu.
Note that this added security is there to protect the system and to keep the settings and data of one user separate and protected from other users on the same computer. Though taking ownership is often useful I think you should understand why it is set up the way it is and understand you are opening your system up for problems should you delete something you shouldn't or you may be compromising another users privacy if you Take Ownership of their files.