Renaming User Account

​My laptop was delivered to my friends house, and as a initial setup was done, the vista account was created in his name: ABC. When I got the lptop from him, I changed the user account name to my name: XYZ.​

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​There is only one account now, named XYZ. But whenever I install any new software, the user name/computer name that shows up in the install shield is ABC.​

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​I can see that in the folder C:\users i still have ABC as the user folder, instead of XYZ. Actually this is the user folder that I Vista uses to store my (XYZs) user enviropnemnt stuff (pictures, facourites, music etc), but under the folder name ABC.​

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​Also, in the contol panel user accounts-> Configure advanced user profile properties, i can see the profile name as XYZ/ABC.​

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​I tried changing the computer name from ABC to XYZ.​

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​Can I remove the ABC name appearing, from my vista permanetly? of course one cant delete the only account on a vista machine..​

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​please help..​

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