the problem is there if u have setup a local lan. u cannot disable file sharing in that case coz it disables them for u as well... better idea is to use a password for your user logins and disable guest sharing.
use any free firewall and make a rule to block incoming connection to ports 135-139,445,1025-1026,500 Tcp as well as udp ( all udp not needed but this ports are of no use anyway) from sify network ..if u dont want to run firewall(if u find it annoying) then start-->run-->secpol.msc and make new policy in ip security policies to block icmp ( if u want to ) as weelll as above ports and u will be safe enough if u dont run any server programs.......best thing about ipsec is it doesnt use any extra memory bcoz its service is already kept running even if u dont enable it ( u can disable of u want) . This is good for less config pc's for win2k Disable $ sharesDisable DCOMDisable NETBIOSDisable netbios name exposingthis arent needed if u block above ports anyway
Ya don't use IE until u need it badly. Use some nice antivirus software like kaspersky and a decent firewall like mcafee or zonealarm. Make sure in the firewall do the setting to "do not trust my lan" . If u wanna add access to any lan pc than u can add tht ip in the allowed list. It works this way in mcafee but not sure abt zonealarm.