Please help! Keeps going into "it safe mode"

Hello, I have an iPhone 3GS version 4.3.3 now I used this site jailbreakme.com and I did it straight from my safari browser on my phone(bc my desktop needs a new motherboard). It installed Cydia and a few other apps but it Just keeps saying "springboard has crashed and needs to reboot and it says mobile substrate did not cause this problem" or something like that. So where the time should be it says "it Safe Mode" and if I try to reboot springboard it will work for a very short time than freeze and I have to hard reset it. i don't know much about hacking at all so can someone please help me? Do I need to restore my iPhone back to factory settings? I don't really know how to do that but saw a guide for it on this site. Or is there a way to fix this? Any input would be greatly appreciated.

Ok thanks, I will try that, question, when I try to remove some apps like big boss icon set It says warning removing this will interfere with the operation of Cydia or iOS, and I don't think I have any cracked apps just downloaded some ringtones and themes, although I did install a snes and genesis emulator, that could be the problem possibly, but I'll remove these emulators and see If that's the problem thanks. Some people have said that they have the same problem when they have a trial app, so maybe I have one of those I'm not sure but thanks for the input