To clear Vista admin password

You need a higher user to do this and the only one high than admin is system, to get access to this you will have to hack vista's logon. 

Steps: 

1.Boot vista installation disc and go to repair. 
2.Open command prompt and type Notepad. 
3.In notepad click on File / Open. 
4.In the box go to C:\Windows\system32 and change document type to all files. 
5.Find file sethc.exe amd rename it sethc.exe.old 
6.Copy cmd.exe and paste it again, it will be called "Copy of cmd.exe". 
7.Rename "Copy of cmd.exe" to sethc.exe. 
8.Restart your PC. 
9.In logon press SHIFT 5 times and cmd window will apear. 
10.In cmd type "Net user administrator *". 
11.Then type new password. 

PS. No character will show wen you type new password.