Yeah Im kinda new at this but am fairly computer savy. I just purchased the 7550 on the verizon network. And I have tryed everything to install third party applications on it using the app loader and its giving me Warnings were encountered during the loading process:The following modules could not be loaded because their digital signatures were invalid....... How do I fix this. It shows the application when I look under applications in the options menu but there is no way to run it. Ive read about peoples administrators locking applications but this is for my personal use. I bought it for my home, not throught my work. How do I get these digital signatures to work? thanks for your help all.

One thing you might want to try. Look at the third party apps you are installing and make sure they are for your OS on your BB. There is alot of software that is ment for older BB's. Also make sure you have the updated OS for you BB.

You either mean a 7250 or 7750 on verizon (click Options - About for the exact model number). The most common cause of this error is if your device is attached to a BlackBerry Enterprise Server and the policy is set to disable third party applications. That being said you mentionned that you are a home user. I would recommend that you wipe the device clean and re-install the latest OS onto it, this could resolve the problem. You can download the latest OS from:

http://vzw.smithmicro.com/blackberry/

When running Application Loader, click Advanced and select to delete all applications and data, this will ensure that you have a clean device. I have seen a few times that a carrier will send you a device that had some bad settings on it, sometimes from a previous return.