SG Broadband Community

i got a pc running xp . when it boots up i have 4 users (icons), no one needs a password to log on. but i cant install new software nor printer under any one of these users - getting a message like - no permission or need administartor account or canot fine/ access file.
how can i add to these 4 users (icons) one more icon (user=admin)
the owner of the unit toled me that on the xp installation he didnt create any password for the adminstrator (left it blank)
thank you very much in advance

try pressing ctrl+alt+del two times at the screen with all of the usernames icons and then typing in administrator where the username box is. You should be able to access the account that way...I hope that helps