Follow along with the video below to see how to install our site as a web app on your home screen.
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su
mount -o rw,remount /system
rm /system/app/CarHomeGoogle.apk
This worked like a charm for me.If you don't actually want to uninstall them, you can also use Root explorer to rename them. I find this method is easier than uninstalling.
Go into system/app, mount r/w, then rename carhomegoogle.apk to carhomegoogle.bak and gmail.apk to gmail.bak. Reboot, then go back into the market and try to reinstall carhome and gmail again. You should get success this time.
I guess this should work with any app installed to /system.