Please start with Option #3 here: https://forum.adaware.com/index.php?/topic/34376-solution-for-lavasofttcpservice-problem-after-uninstallation/&do=findComment&comment=151613
If that doesn't help, let us see what's going on in your computer and how to remove Web Companion.
Please, download Farbar Recovery Scan Tool (FRST) and save it on the desktop: https://www.bleepingcomputer.com/download/farbar-recovery-scan-tool/
Double click FRST file to run the tool.
Read the disclaimer and click Yes to accept it.
Click Scan button.
When done, FRST will create two (2) log files on the desktop:
Please, attach them to your reply.