Instalación Reporting Services

Hola,
En un Servidor Windows Server 2003 actualizado, IIS, SQL Server 2000..., al
instalar Reporting Services dice que IIS no está instalado o que no está
configurado de forma compatible con Reporting Services.

He comprobado todos los requisitos que tiene que tener instalado para los
componentes de servidor y en principio está todo.

Alguna idea?

Gracias y un saludo,

Extracto del fichero log de instalación:

<Prerequisite Name="IsIISInstalled" Checked="Metabase"
Item="/LM/W3SVC/1/1016" Found="Can not read value" Expected="No error"
Result="Fail" />
Machine = MACHINE, Article = IIS, Result = 60350 (0xebbe)
<Prerequisite Name="IsVS71Installed" Checked="Registry"
Item="HKLM\SOFTWARE\Microsoft\VisualStudio\7.1" Found="Can not open key"
Expected="No error" Result="Fail" />
Machine = MACHINE, Article = VSNET, Result = 60351 (0xebbf)
Machine = MACHINE, Article = ASPNET, Result = 0 (0x0)
Machine = MACHINE, Article = MDAC, Result = 0 (0x0)
Machine = MACHINE, Article = DTC, Result = 0 (0x0)
Machine = MACHINE, Article = SERVEROS, Result = 0 (0x0)
Machine = MACHINE, Article = SHAREPOINT, Result = 0 (0x0)
Machine = MACHINE, Article = AUTHZ, Result = 0 (0x0)
Machine = MACHINE, Article = RSACCOUNTS, Result = 0 (0x0)