Are you useing WinPE 256, WinPE 512 or DOS? Have you tried the others?
Make a VP from your server and run it manually on your HP. When you enter Ghost32, exit out and type IPconfig and see if you get an IP address. If you do not have an IP address please go to: www-secure.symantec.com/connect/blogs/intel-825xx-drivers-and-instructions-extract-them
If you do get an IP address try net use y: \\yourghostserver\imageshare /user:username password
and see if you can get into the y: drive, if the command failed you likely don't have security.
Should all the above work, kick off x:\ghost\ghost32 and try to manually ghost your PC and see what happens. Should it fail, then in x:\ghost will be an Ghosterr.txt file. Copy it to your network drive and post it here.