My iphone 4 doesn't let me to install apps?

My iphone 4 is on 6.1.3 and its jailbroken with redsnow. I have 3 GB memory left and my iphone downloads the app but it won't install it. I can't even install the apps using itunes and itunes doesn't even backup my iphone. Please Help

Added (1). Yeah I have appcake and vshare as well and they both giving me error for installing.

Check wisely coz it can be possible that either you have lost your data connection, network or it can be a setting problem!

Did you install the Installus or AppSyn from Cydia?

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