MT4G Market App Help

[hruehl]

i have the mytouch 4g android phone running OS 2.2.1. This past weekend I bought and downloaded an app (My Backup Pro) that is suppose to back up the phone's settings, memory card files, everything...ever since I installed the app I cannot download anything from the Market app on the phone. However, I can go to android.com, sign in there and install apps that way. I have cleared the cache in the "running applications", uninstalled the current Market app, then reinstalled, rebooted the phone...STILL nothing. I have restored my phone 5 times since yesterday...the market app isn't working, I can't view my images on the phone in the gallery now, and my music will not show up either. Please advise.