Apache Won't see DNS

[Ken Holmes]

Hello everyone I finally went through the DNS howto and understood most of what was being said.
I took the example and applied it to my virtual hosts and they all worked fine then all of a sudden my Apache wouldn't supply the proper path.  It worked fine all day and then out of the blue it doesn't work anymore. I killed the httpd process restarted it and I get 
[Mon Nov  1 13:51:05 1999] [error] Cannot resolve host name headcounter.com ---
ignoring!
[Mon Nov  1 13:51:06 1999] [error] Cannot resolve host name afterimageds.com ---
 ignoring!
[Mon Nov  1 13:51:07 1999] [error] Cannot resolve host name mynetstore.net --- i
gnoring!
The mx records work fine when I check the email's I get no problems.  Here is one zone file that I have.
Can someone tell me if there is a problem with this.
@  IN SOA virtual.virtualworldinc.com. hostmaster.virtualworldinc.com. (
   1999080903 ; serial
   3600 ; refresh
   900 ; retry
   1209600 ; expire
   43200 ; default_ttl
   )
   NS ns
   NS virtual.virtualworldinc.com.
localhost  A 127.0.0.1
ns  IN A 207.179.141.20
   MX 10 mail
   MX 20 mail.virtualworldinc.com.
   HINFO "Pentium II 400" "Linux"
www  IN A 207.179.141.20

mail  IN A 207.179.141.20
   MX 10 mail
   MX 20 mail.virtualworldinc.com. 
www  IN NS virtual.virtualworldinc.com.
ftp   A 207.179.141.20
   MX 10 mail
   MX 20 mail.virtualworldinc.com.


--------------------------------------------------------------------------------

Here is my reverse zone
@  IN SOA virtual.virtualworldinc.com. hostmaster.virtual.virtualworldinc.com. (
   1999102701 ; serial
   3600 ; refresh
   900 ; retry
   1209600 ; expire
   43200 ; default_ttl
   )
@  IN NS virtual.virtualworldinc.com.
1  IN PTR www.virtualworldinc.com.
2  IN PTR www.mynetstore.net.
3  IN PTR www.afterimageds.com.
4  IN PTR www.garderiecam.com.

I only have one name server because I don't have the luxury of owning 2 machines, is this gonna impact my DNS in anyway?
This is my master
Also my DNS for virtualworldinc.com is handled by my ISP is this gonna impact my DNS?
@ IN SOA virtualworldinc.com. 0 (

1999102101 ; serial

0 ; refresh

0 ; retry

0 ; expire

0 ; default_ttl

)

1 IN PTR localhost.

@ IN NS virtualworldinc.com.

Thanks for any help you can give