12. I installed the TCP Optimizer, and now Windows crashes, my programs don't work and my PC seems to be melting ?
The SG TCP Optimizer simply changes a few networking related buffers in the Windows Registry. It's almost impossible for the program to cause crashes or have any such negative effect on your OS, look somewhere else.
The worst that can possibly happen by using the TCP Optimizer (although highly unlikely) is for you to lose network connectivity, in which case you can restore your Registry to a previous state.
You can use the TCP Optimizer's "File>Restore Windows Defaults" or "Restore backed up settings" menu, or you can reset TCP/IP.