Sorry if this has been posted anywhere else in these forums(new to android, new to forum), but I rooted my phone successfully without any real problems using the "one click root button" for the Samsung captivate then downloaded the ti-backup app(free version) and before it can back up my apps, etc... a prompt keeps asking me to go to phone settings>applications then click the unknown source button so that i can recover/reinstall my apps if/when I upgrade to 2.2. problem is the "unknown source" checkbox is nowhere to be found?!! has any one else had this problem? what am I missing here or doing wrong? 
