Find the folder they're in and delete the folder.
First examine the folder and note the names the program uses for
itself, write them down.
Next see if there's a program called "uninstall.exe" or "remove.exe" or
"unwise.exe" or something similar and click on it to uninstall.
Then do a search for files using any of the names you recorded in the
first step, remove any to the recycle bin so they can be restored if
problems occur.
Last, run regedit, backup the registry and search for any keys bearing
the names you recorded above.
That should get rid of most programs but learning the names is
important, for instance, Zone Alarm, maybe the hardest of all software
to get rid of, uses vsdata.dll, vsdatant.sys, vsmonapi.dll,
vsnetutils.dll, vspubapi.dll, vsutil.dll, etc. Fortunately, Zone Alarm
is one of the very few software companies that does publish full
uninstall info on their website.