It seems the user doesn't have the rights to access IIS.
Try the following. Give access rights to the user for Inetpub folder. Make sure the particular user exists in the SQL Server 2000.

after a default install you should go into the IIS settings under directory security and check "integrated logon option". the sharepoint  installer will sometimes uncheck all access settings.

Thanks for your response but still I could not make it
work.

I could not access the Sharepoint Central Admin and
getting the same error message: "You do not have
permission to view this page."

I have installed Sharepoint portal  but could not view
Central Admin to configure my Database. I have
followed the admin guide regarding Single Server
Deployment but no success.

What should I do? Please help. I'm very desparate. I
could not have a successful installation of Sharepoint
portal. I'm using win2003 and SQL server  in my server machine.

Perhaps my step by step setup guide will help. You can download my PDF
here:
www.mindsharp.com/.../...ntDeveloperSetupGuide.zip

I would like to know if user account defined/specified
upon Single Server Deployment required to be a member
of the Active Directory.

Is it required to be member or not? Does user account
have effect on Single Server Deployment?

The single-server deployment  vs. multiple server  deployments is
irrelevant to your question. You can use local accounts for a
SharePoint deployment, but it is *highly* recommended that you use
domain/AD accounts. While not required, it is strongly recommended.

Does this help?

I would suggest you contact product support services.