Nextbook 7 HELP!!!

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http://www.mobileread.com – Ok My tablet was fine the last few days, My freind was using it to do the internet (on it alot) but did nothing to it. today I noticed half my apps (including kindle and barnes and nobles) are missing, they clame there on the memory card. The memory card is in and unlocked. I took it out, turned it off, put it in and nothing! Im very upset cause it clames slideme is on the card too and thats the one I use to get free apps! Anyone got any ideas? I would just like not to loose my apps and my e readers (cause then I would have to redownload all my books right?) (HowTos)