回複：一不小心,裝兩套XP.如何刪除一個?每次開機提示要選一個.煩!

You can not unless you format you hard drive, but there is something you can do to avoid the trouble at start up.
Edit your boot.ini file, run-> cmd -> msconfig ->boot.ini, you will see two Windows XP here, delete the one you are not using, make sure you know which one is which