Shared folders no longer accessible after NAV08 upgrade

Since my upgrade to Norton NAV2008, shared folders on my Windows XP Pro PC are no longer accessible from other PCs in my home network (workgroup). I have no problems accessing shared folders on the other PCs nor do they have problems accessing shared folders on each other. When I start my PC in Safe Mode w/Networking the shared folders and their contents are again available. FWIW, the other two PCs in the network are NOT running any Norton products. TIA…