I took both PC's down to safe-mode w/networking. All file share worked fine. No problems. Brought PC's back to normal one at a time. XP Home PC can see all file shares but can't access XP Pro shares. XP Pro can see all file shares and can access all file shares. Only when I put the XP Pro PC back to safe-mode w/networking does everything work fine. Suspected McAfee so I stripped it but that didn't solve anything. Put McAfee back on so PC could be used today (This is an active office.) Not sure what to do next. Should I start stopping processes on the XP Pro PC until I find the one that is causing file share to fail? Is that even possible to do without crashing?
OK, I finally fixed my problem. These are the steps I took. Removed unused protocols of IPX/SPX and TCP/IPv6. Reset the Winsock using the command - netsh winsock reset - and rebooted. During reboot, entered setup (used to be BIOS setup), and disabled the onboard LAN adapter. Had partial functionality but the network connection started having problems. Disabled the wireless network adapter. Uninstalled the Linksys software through Control Panel > Add/Remove Programs. Turned off the computer. Removed the wireless adapter. Booted machine and re-installed Linksys software following the normal installation instructions. When prompted, turned off machine and re-installed wireless adapter. Rebooted and had all functionality. Noticed, post-op, that there was now another wireless network available in my area that was on the same channel as I was so I went into the router and changed the channel from 6 to 1 (11 was already in use too). I have had no other problems. There was a link I used to find out A LOT of information on what to do it is: http://winhlp.com/wxnet.htm I also took the time and read through a lot of Microsoft kb article threads.