The 2014 Spring Madobe Family Original Theme Pack is a CD-ROM that came with some copies of Windows 8.1 during a campaign ran by Windows Navi+ with some partner shops from March 5 2014 to April 13 2014 in Japan.
It contains short audio files of Yū (voiced by Asuka Nishi), Ai (Nao Tamura), Nanami (Nana Mizuki), and Claudia Madobe (Eri Kitamura) and a .deskthemepack file, which itself includes two 3200x1800 backgrounds of the four girls.
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It is not know how much of these discs were made. Their rarity appears to be similar to several other OS-tan discs, being uncommon but still appearing occasionally on Japanese markets. There does not seem to be a particularly high demand for these.
The various shops sometimes included their own bonuses with the disc, and finding a specific set, which may contain more items featuring OS-tans like pins or telephone cards, can be extremely difficult.