Android 1.5 not installing some apps?

[mhf2player]

I've had this phone for over a year, and all of a suden, most of the apps now give a unsucsesfu install, I've never had that problem before, any help??

 

[LoganS]

What apps are you trying to install?

There are a ton of apps that only work with Android 1.6, 2.0, 2.1, 2.2