APK's won't install

[bassman1547]

I had this problem with the amazon appstore. then suddenly. for. no reason apparent to me, it installed. now no Apk I. download. will install. any ideas? unknown apps is checked.
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[BayouFlyFisher]

I had this problem with the amazon appstore. then suddenly. for. no reason apparent to me, it installed. now no Apk I. download. will install. any ideas? unknown apps is checked.
Sent from my DROID BIONIC using DroidForums

Try installing with a different File Manager. Try some of the ones in the Market. I use Root Explorer, but I'm rooted. You may try Astro File Manager, I've used it in the past and it worked.