Finally worked for me too:
- just did Step 5 with no reboot
- registry wal already a 1 (no change needed)
- downloaded SP to desktop & ran it

"NikB" wrote:

> Simple solution to problem I was researching for a day or so.
> Step 5 was all I needed to change and no reboot.
>
> (Full error code is 0x80070643
> Visual Studio 2005 Service Pack 1, SP1 )
>
> Nik
>
> "Paul" wrote:
>
> > I am running Windows Server 2003 SP1 and Visual Studio Professional and had
> > the same problem and error message that you are experiencing and this fixed
> > the issue for me. I did the following:
> >
> > 1. Click Start, click Run, type control admintools, and then click OK.
> > 2. Double-click Local Security Policy.
> > 3. Click Software Restriction Policies.
> >
> > Note If no software restrictions are listed, right-click Software
> > Restriction Policies, and then click Create New Policy.
> > 4. Under Object Type, double-click Enforcement.
> > 5. Click All users except local administrators, and then click OK.
> >
> > I then changed
> > HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers
> > PolicyScope, and then change the setting from 0 to 1.
> >
> > 6. Restarted the computer.
> >
> >
>