May be I was not very much clear in the message with subject "Damn Vista".
Actually I am using Vista Home Premium in my Dell Laptop. There is only one
account which is administrator account and which is me. In the control panel
it also shows my status as administrator. Now Vista always prompts and
prevents me to install different softwares from websites for example right
now I have pending two different critical BIOS updates from dell, but it
always does not allow me to install them, prompting you need to be a
administrator to install these updates. I dont know what is it prompting I am
already administrator? Now I hope I am able to convey my problem. Cheers.