Not having one of these web cams, I am short on competent ideas - so here is the last one I might try:
Note - this assumes you have a disc with the drivers and software, and that you are running Windows XP.
Disconnect the camera > uninstall all software and drivers that were installed with the camera > reboot > delete any folders for said software that are left in "C:\Program Files" > check in Task Manager for any of the processes you are concerned about, to make sure they are now gone (if not, they are probably not part of the web cam installation).
Turn off the computer > connect the web cam > boot the computer > allow Windows to recognize the hardware > if Windows tells you the hardware has been installed, but there may be a problem - use one of the following to install the drivers only:
1 - If the hardware wizard pops-up, use it to install the drivers.
2 - Use the installation disc to install the drivers - only if it offers the option to install "Drivers"
3 - Right-click My Computer > Properties > Hardware tab > Device Manager > look for the web cam device (it may have a yellow question mark by it) > right-click the web cam device listed > select "Update driver" > select the option to allow Windows to automatically install the drivers > place the web cam installation disc in the cd drive > click next to tell Windows to install the drivers > after completion, cancel any additional software installation attempted by the disc > remove disc.
You can then test the camera for functionality, and if all is well you are done.
If on the other hand, you find that the additional software is needed, I believe you are stuck with using it. Another possibility, is that the lvcomsx.exe file is connected to the driver(s). For example, ATI's new drivers install an ".exe" file, which runs in conjunction with the drivers.
Note - I use method #3 all the time, which enables me to install the hardware and drivers only.