I'm using Windows XP SP3 on a PC with an Intel Core 2 Quad CPU 2.40 GHz with 2 GB memory and plenty of disk space. I've been running Logos 3 with Gold library since it was released.
On my first attempt to install Logos 4 from a download, my operating system got so corrupted that I had to reformat the disk and do a clean install. On my second attempt form the CD the Winsock keys were damaged and I lost most Web browsing. On the third attempt I got a fatal error perhaps a minute or less into the install; removing Logos 4 with "Add/Remove Software" generated another fatal error, but everything seems to have been removed anyhow (it seems to have removed a lot of fonts from Logos 3 as well, but these were easily restored through Logos 3's "Tools | Libronix Update").
Logos's Tech Support have been very pleasant but unable to help. I am hardly a Windows expert, but am a fairly sophisticated user and have never experienced these kinds of problems installing software.
Can anyone suggest how I might figure out what's going on?