The winning goal came in the 25th minute from a Blackstock header.
A decent crowd over over 2,500 turned out to watch the match.
Stuart Gray said afterwards
"I enjoyed the second half performance against Q.P.R. I thought we were at it and more like us. In the first half we showed them too much respect and did not work hard enough. After half-time we made a better game of it and we were more like our old selves."
"I felt we deserved a goal in the second half but although we created a couple of good chances we couldn't quite take one of them."
Line Up.Cobblers: Mark BUNN, Jason CROWE, Danny JACKMAN, Mark HUGHES, Gabor GYEPES (sub Ian HENDERSON 82), Liam DOLMAN, Giles COKE, Leon CONSTANTINE, Colin LARKIN (sub Ryan GILLIGAN 63), Kevin WATSON (sub Abdul OSMAN 46), Andy HOLT (sub Liam DAVIS 63)
Substitutes not used: Chris DUNN, Alex DYER, Greg TAYLOR, Ritchie JONES.
There is a full match report here on the official website.