You have different problems! The hint was only to change an password. Unless you really messed up the instructions then something else went wrong. Do you still have the OS X install disk? If you do then do an Archive & Install to keep your programs and fix your system problems.
Plus did you read the hint [HOWTO] Fix User lost Administrator privileges?
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Mac Pro Dual 2.8 Quad (1st gen), 14G Ram, Two DVD-RW Drives, OS X 10.6.2
Mac Book Pro Core 2 Duo 2.16Ghz, SuperDrive, ATI X1600, 2GB RAM, OS X 10.6.2
2TB Time Capsule
32G iPhone 3GS Black |