If you need any help with this at all, PM me. I have been running Apache on Windows 2000/XP since October 2002.
You can take a look at my httpd.conf file, which is written for one server to support 3 sites (endeavour.zapto.org, excrucio.zapto.org, studiosmaster.zapto.org). It is located here,
http://endeavour.zapto.org/httpd.conf.txt. The virtual hosts section is at the end.
Also, that is some pretty substantial hardware firepower for running Apache. I have done a lot of performance testing with Apache for Windows and IIS 5.0. Barring heavy CGI/dynamic work, that server of yours will be able to handle an incredible load. On a Pentium 166mhz, 64MB ram, 4gb hard disk, I was able to handle 9 requests/sec under Apache 1.3.31, 414 requests/sec with Apache 2.0.50, and 434 with IIS 5.1, with a static, 1kb text page. Yes, that massive jump from Apache 1.3.31 to 2.0.50 is correct. The numbers here are averages of 8 trials, with the cache cleared between trials. I got that system to stay up for a maximum of 129 days, before lightning took out the power here.
If you need any help with Apache on Windows at all, PM me.