Gene theraphy: Rewrite your own genetic code

Hi dear readers,
As this blog was named as ideas to share, i have never share any of my own ideas yet ^^. so today i will post one of my idea that i have been thinking since my second year in my medical study. i got this idea when i attended a lecture that told me about the mechanism of retrovirus, about how can it blends its genes inside the host DNA.

(Hiv virus)

As we know, retrovirus such as HIV virus can integrate its DNA to a host DNA. by doing this it can force the host to mistakenly produce the virus proteins in the protein synthesis process. so i think why don't we take advantage of this mechanism?

Today we still don't have any functional nanosized machine that can repair or modify our DNA. but this virus has the way to accomplish this. and we already have a technology to alter the virus genes so that the virus will not bring its genes to the host, but instead will bring genes that we give it to deliver. in doing this, codes in the virus dna sequence for DNA integration will be keep, and codes for producing the virus proteins will be replaced by our codes(DNA).