Windows xp updating hosts file
This article covers the default security settings for DNS zones: the settings are jacked up (or even if they are fine), you might try just blowing away the reverse zone and recreating it since you basically have a non-functioning reverse zone as it is...
Try running an "ipconfig /registerdns" on one of the clients and see if it adds a record to the reverse zone.
1a) Even if these are enabled, you might need to make sure the DHCP server has permissions to update DNS records.
The forward DNS entries ("A" records) for windows machines on the domain are populated automatically.
However, the reverse DNS entries ("PTR" Records) are not.
Please follow the instructions even if you do not have another software program installed, since the activation and/or updating problems could be caused by a malware infection.
If after following any of the instructions above, you are still having problems activating Spy Hunter or is not able to assist you, please fill out the "Spy Hunter Activation Inquiries" form and one our technicians will contact you.