Most likely, if Windows shows them in the "Uninstall Programs" then they are still in the registry. Don't play with said registry. I had one friend... he did something to the registry.... Steve where are you
If you aren't using the integrated graphics (which you wont be) the 4770k is practically identical, or look at this comparison http://cpuboss.com/cpus/Intel-Core-i7-4790K-vs-Intel-Core-i7-4770K
EDIT and this
4.18 pt/$
vs
3.36 pt/$
Around 25% better performance per dollar