injector help?

i dont know why but most of the injectors that i use don't work anymore. i used to just Njector but it stopped working.. i used the NSY injector but it crashes on me when i use the MPGH hack.. whenever i use another injector, such as perX, it'll say something like:
"! Cannot execute "C:\Users\Owner\AppData\Local\Temp\Rar$EX17.464\Pe rX.exe"
and

"PerX.exe will be compressed only after closing the application using it. Modificatios will be lost if you close WinRar before that"

... im using a window's 7 64 bit, im using it through admin and everything but thats what it saids..
help please?

Have you tried all of it in the ca tool section?