mrzee,
I have not heard of many complaints of Avast4 and W95, but since it is an older platform, not many users still have it.
Anyway, did you try to upgrade "over" version 3 ?
At this point, it sounds like a corrupted file which may have occured during the installation.
I would recommend that you uninstall Avast 4, download a copy of Avclear and Avclear4 from the Avast site and use both to completely clean out your system of any leftover Avast files.
Make sure all Windows apps are shut down prior to starting the installation, and then try a reinstall of Avast4.
Let me know what happens.