incompatibility between XP firewall and printer sharing/network drives?

[CW]

Hi,

I am running XP home.
I map network drives so I can use shared printers on the network.

Recently I enabled XP firewall to protect myself against the recent
wave of worms. However, I noticed ever since I enable XP firewall, I
can't print to my shared printers after a while. It doesn't happen
immediately, only after a while.

What can I do?

Thanks!