Problem with Internet Information Server IIS 5.1 and version 6.0.1091

Avast Free Antivirus / Premium Security
1

I use a localhost with IIS 5.1 on Win XP.
When i upgrade avast for version 6.0.1091 my IIS stop.

If i turn Avast off, IIS stay OK.

2

updated to 6.0.1125 but the problem remain.

If i call a ASP page on IIS 5.1 on xp sp3
nothing happens.

If i turn Avast OFF, the IIS starts up.

The problem start after i upgrade to 6.0.1091.

Where i find older versions? I can´t continue without Avast or IIS.

3

Is it the WebShield that’s causing this? I.e. if you stop WebShield, can you start IIS?
And what port is it listening on? WebShield listens on localhost:12080.

Thanks
Vlk