If it has to do uninstalling SAMP-Addon, then here some steps.
1. If you just uninstalled SAMP-Addon, then restart your pc.
2. After you restart it, uninstall your SAMP client. (you need to restart your pc so the file called 'gta3weaptf' like that will stop working)
3. After uninstallation, install an another SAMP Client.
P.S It happens to me when I just uninstalled the SAMP-Addon from the Control Panel.
Problem Solved.