I would suggest that you go into the Administrative Tools ,, found, (if you have not customized your program lists) in the Control Panel,,
Open COMPUTER MANAGEMENT, and look in the left pane for USERS AND GROUPS,,
choose GROUPS, and then DBL CLik on the ADMINISTRATORS group located in the RIGHT pane window..
When this opens, you will see all the accounts on your PC that have ADMINISTRATIVE PRIVELEGES,, If your account is not there,,there are two things to do,, either hit ADD at this time and put your user account into the group,,,
or ,, exit this,, and go into the USERS folder,, open YOUR account and edit the profile so that you are in the ADMINISTRATORS group,,
In doing this,, You need not have the Admin account on your splashscreen,, because YOU are the administrator and have the power over the local machine and users to delegate permissions,,
this shouls fix you up..