There is little doubt that Sandeep will take care of the problem, but just in case you get together tonight, a few thoughts. (Shots in the dark)
1. I know you got rid of 15GB of log files. Do you now have 16.4GBs?
2. What antivirus are you running, and can you turn it off and try to connect?
3. Can you simply turn off your firewall on the server and client?
4. Dumb question, but are your clients the same version as your server?
5. Have you tried Amazing Utilities -> Advanced -> Try #1 and #7.
6. What are the permissions for the folder and the databases especially on meds.mdf and codes.mdf. You should only need permissions on the folder? Are you using Everyone for the share (as Microsoft recommends) and authenticated users or domain users for the security permissions?
7. Could you please open the AmazingCharts.xml file in the main computer's AC folder and copy and paste its contents? There is nothing in the file that should not be seen. I would find that helpful?
Can you give the outcomes to all the questions? Otherwise, it is difficult to troubleshoot.
Thanks.