Answer for URGENT Problems with Cydia 1.1.6 on IOS 5.1.1

Sorry, but Cydia can't be removed just like that. The only way to remove it is by restoring the iPod. The error might be because you're loading NAS packages that this version of Cydia doesn't support. You need to remove any unused packages or post a snippet of the error message so we can see what it says. Also, install0us stopped working a long time ago.