Sorry I didn't answer about the task killer sooner. Android has a built in manager and uses what it needs. Unless you have the task killer set up just right you could be killing things that need to run and making your battery life worse when it has to restart them constantly.
As for the error 25 make sure that's the error. Here's a list of nandroid error codes. http://www.droidforums.net/forum/tec...ror-codes.html