I am a new Droid user but I can't seem to find a similar problem in the forum.
The apps I downloaded disappeared in the Apps menu when I hooked up the phone to my PC to upload music. I think I did install the suggested software (that popped up) on both the PC and phone.
All the apps that came with my phone seem to work.
The apps show up when I go to manage them - but I can't open them - or do anything but uninstall them, clear the cache and move them from the card to the phone.
I have restarted the phone several times.
I have deleted them and re-installed and I have done the re-set on the phone (but not wiped the SIM Card)
Any ideas? It's probably something really stupid & obvious...