Apple today announced that it will drop support for iTunes Store on Windows XP and Vista PCs from May 25, 2018.
Since Apple is introducing security changes, older Windows PCs will not able to use the iTunes Store. If you have previous version of iTunes already installed, you can continue to use it without support from Apple. However, you won’t be able to make new purchases from the iTunes Store or redownload previous purchases on that computer.
After May 25, you will require a Windows 7 or later PC with the latest version of iTunes to make purchases from the iTunes Store and redownload previous purchases.
You can download the latest version of iTunes from Apple here.