You can also technically delete all the installation files and then clean up your registry using
ccleaner or similar programs, but you might end up still having some of Bandicut's files on your system.
I get that you don't want to disable your firewall if you install new software, but what software infects you during the uninstallation?
If you don't trust bandicut, you might wanna scan the installation file on
http://www.virustotal.com .
But what's more important, your statement is sadly but deadly just wrong.
You are not secure, just by using a firewall or antivirus.
You are secured, yes, but on a very, very basic level.
I'm not going to dive deep into this theme, to not start an enormous discussion...
If you are German, you might wanna check out
this Youtube video and learn a bit on how to really be secure.
I hope I don't bug you with that.
--Zuzu_Typ--