Right click the launch file '.exe' go to properties, click on the compatability tab and select run this program in compatability mode for (choose an OS) This doesn't always work but is worth a try.
Could be the Cat5e cable you used in Hook UP 2 to connect to computer A or even one of the ports on the router. To test use HOOK - UP # 2 again but swap the Cat5 cables between the router and the computers A & B and also try different ports.
Do you have NAT configured on the router? if you are...
For interests sake:
Partition magic does not support any server OS's. You would need to purchase symantec/powerquest volume manager which costs a bundle more.
If you want to host an internal web server behind your firewall you will need to set up port forwarding on your firewall. Forward ports 80(HTTP) and 443 (HTTPS) to the internal ip address of the web server. I dont know apache so can't help you on that. There are probably easier ways of sharing...
PDOXUSRS.NET..... not malicous
This is a bit a rough explanation but to my knowledge it is a file used when accessing paradox tables. It makes sure more that not more than one user is accessing the same information at the same time.
http://www.adug.org.au/reference/ti3160.htm
Are these machines running in a workgroup or a domain? Follow the link mentioned by petro but when it comes to the security/permissions tab remove the everyone group and add the username of the user you wish to allow access...
First make sure your hub/switch is working. Give static ip's to two machines connected to the switch, make sure they are in the same subnet - then test connectivity between the two machines by using the ping command.
Once you have established that your switch is working fine focus your...