I'm not sure what's going on there, or if it relates to permissions, but
you can try two other things. You can try going to secpol.msc>Local
Policies>Securitie Options and configuring the last 6 entries for all admin
to be enabled. If you need to you can try to save everything you install as
a .exe. If you think that the .MSI is not working properly, you can try
following the steps for the XP MSI in this MSKB, Part 1:
"Error 1719: The Windows Installer service could not be accessed" error
message when you try to add or remove a program
http://support.microsoft.com/kb/315346/en-us
The info you've provided in your posts is simply too scant and too nebulous
for me to have a clear idea what your problem is and I can't seem to coax a
full story from you. That's preventing me from giving optimal help. Maybe
someone else can extrapolate this.
2) Run "Net user administrator active:yes" from an elevated cmd prompt.
3)
Go to: HKEY_Local_Machine\Software\Microsoft\Windows
NT\CurrentVersion\Winlogon
Add a new key: SpecialAccounts
And a sub-key in the SpecialAccounts key: UserList
In the UserList key, create a DWORD (32-bit): Administrator Set value to: 1
CH