iTunes isn't installed on both user accounts on PC How do I change where iTunes is installed to on Windows? For example, on my PC, iTunes shows up on my husband's user name but not mine.
When you install a software on windows it usually asks "install for this account only or for all accounts". It looks like your husband chose "for my account only". I do not know any option to change this later.

Last week I re-installed a program I had the same problem with. When it asked me, I then chose "for all accounts".

The user settings for the existing installation were not harmed.