Symptom:
Problems occur after installing Windows XP Service Pack 3 or Windows Vista Service Pack 1 with a Norton 2008 product installed
Numerous registry keys are added when you upgrade to Windows XP Service Pack 3 or Windows Vista Service Pack 1 with a Norton product installed. Because of these registry keys, you may experience one or more of the following symptoms:
• Windows Device Manager is empty
• Missing Wireless network adaptors or other hardware devices
• Unable to connect using a wireless adapter
Solution:
To fix the problem, download the SymRegFix.exe file.
Source: http://service1.symantec.com/SUPPORT/sharedtech.nsf/docid/2008061807392313