unknown software

hello guys, two programs has automatically been installed in my system

1-interstitial ad delivery by 180 search assistant
2-pad lookups by 180 search assistant

when i tried to uninstall it, it takes me to site http://www.n-case.com/ncaseaduninstall.html that i should download this uninstall file first, and uninstall the programs online. What should i do, either this uninstall file can damage my pc.
thanks,
i have remove the registry keys through "hijackthis".
thanks.

1 more thing, my internet connection is automatic disconnected after about 15 minutes also.

 

http://www.lavasoftusa.com/support/download/

Download this instead then install it, then run it. It should remove the spyware and trackware you wish to uninstall.