hi can anybody tell me why my netcomm NB9WMAXXn would just stop connecting to the wireless products in the house all the products are picking up the wireless network but wont connect

And are you using avast? Any other old antivirus? Firewall? Operational system? Browser…

no just avast, XP and laptops trying to connect are using win7

Well, difficult to say as avast free is just an antivirus and should block anything.
Isn’t it a problem on that particular computer network (drivers, settings, etc.)?

See if the following is of any help:
http://www.netcomm.com.au/sm/common-questions/nb9wmaxx/how-to-stop-wireless-dropouts-and-improve-the-signal