Error installing Eset 5

I keep getting this error when trying to install Nod 32 5. it runs then after a while is says Error computer wasnt restarted from a previous installation restart computer and install again wtf
Answer #1
well did you restart the pc? and do you allready have another antivirus installed? if you uninstalled it and restarted, what antivirus did you have?
Answer #2
you may have some traces of nod32 left from a previous version.
uninstall nod 32.5 then follow these steps,

http://rancidtaste.hubpages.com/hub/How-to-uninstall-or-remove-ESET-Nod32-antivirus-totally
then after rebooting your pc reinstall. google is still your friend if you had a different antivirus check it.
Answer #3
ok heres what I have on the pc. I used to have Eset 4.0 something, I have malware antimalwar bytes whatever the name is. I have registry mechanic, and Spyware doctor no Antivirus for this. Ive tried to install 5-6 times now cleared all registry files all folders everything and still nothing. I recently got a Trojan called Win7 Antivirus 2012 but everything was cleaned with spyware doctor
Ok I uninstalled all my spyware programs I cleared all the folders and registry files in the tutorial. restarted, I run the installer halfway through I get error ” Eset installation failed because of an error try launch installer at a later time”
I lauch again then half way in it says “Error computer hasnt beeen restarted from previous installation WTF? ~censored~ eset