IPhone 3g Applications not working.

Question

Hi there, my name is Eden
I just recently bought my iPhone 3g and recieved it yesterday, luckily on my birthday=P
Anyways, my iPhone was working perfectly with no problems and no errors, untill now. I downloaded an Application, iLightr and while it was loading to be downloaded, i deleted some other applications i Did not want no more. When the iLightr application was done, those applications i delete and another application that i never seen popped back up. I deleted them again including the application i never seen.
Anyway, this application was named something with an F i dont remember perfectly.
After deleting those applications, I tried to work my AIM Application. It did not work. When i clicked it, screen goes white with stripe as if its about to load AIM and then it goes back to the main page of the iPhone were i have my applications, SMS AIM Facebook Myspace and games.
All my applications now do this, and it is bugging me out.
Can someone help me in an easy way because I am still a child and do not understand a lot of words that are complicated. Thanks!

Answer 1

Okay, my dad's phone had (or has) the same problem so I've spent many many hours with and without a mac genius trying to find a solution, so I've since formed a number of vague ideas about why the problem occurs:
The problems started shortly after I had authorized his computer to play my Texas Hold Em app, and he subsequently tried to upload it to his phone (let me know if any of you tried something similar). I don't know if this was to blame at all, but I'm pretty sure the issue has to do with authorization: for some reason the account used to download apps through iTunes and the account used to download apps on the iPhone were seen as two different accounts, so upon restarting or resyncing there was a conflict between accounts that made the iPhone think it wasn't authorized to open the apps that were uploaded to the phone (which is why the primary apps will still work - no downloading or syncing involved). Some of the solutions I found to the problem also reinforce this:
The first time I was able to fix it was by selecting the phone in iTunes and toggling some of the info (calendars, email, contacts etc) that was supposed to sync to the phone. First, they had been auto-deselected for some reason, so when I told iTunes that it was supposed to sync that info (by clicking the checkbox) it came up with a warning that said something like "are you sure because this iPhone is linked to a different account" and then it might have mentioned erasing or something but either way it was mistaken because the phone had only ever been synced with that computer (it was in fact a brand new 3g that the mac genius had just given us over the course of troubleshooting) - so I said sure erase it or whatever and everything worked fine, 3rd party apps and all.
That fixed it for a while, but when it happened again I did EVERYTHING. I restored the phone to factory settings, reinstalled the entire OS on the MacBook (meaning all apps deleted, etc, etc), and DID NOT restore the phone from a backup. Before syncing I also deauthorized his computer from his account AND my account, then reauthorized him for his account only. I had "sync applications" selected in iTunes, but I told it to never upload apps from the phone to iTunes. That all fixed it for the longest period yet, but the problem recurred once again yesterday, and then it froze on the silver boot-up screen (any of you having this prob too?).
This time we fixed it by putting the phone into recovery mode (hold down the lock and home buttons together and keep holding them down past the restart until you see the plug-into-itunes logo) while it was plugged into itunes, deleting all applications from iTunes, and setting the phone up as new (do not restore from a backup). Now it's working again.
So I say it's either a recurring bug to the iPhone, or there is some residual bad info on my dad's account on the apple servers that somehow keeps making it to the iPhone or iTunes thus causing the conflict again. I know it doesn't make sense when I say it, but It LOOKS like the iPhone and iTunes think they're actually two different accounts so the iPhone eventually thinks it's not allowed to play the apps it downloads. Either way, I'm turning off app syncing on the phone for now and just managing them purely from the phone itself.
Hope this helped ANYBODY .