unable to locate hardware pro tools 9

[mista yg]

ok... ive purchased a breand new computer with windows 7
downloaded quicktime 7
and purchased pro tools 9 with the avid interface
..... after i finished downloading pro tools and i open it
it says
unable to locate hardware... connect hardware and make sure its on and click ok


1..... the interface dosnt have a on off switch
2.. i can hear myself through the headphones with the mic, so its working
3..i'v uninstalled reinstalled at least 8 times
4...my i lock is connected

i even got it working once ..... and then turned it bk on and it didnt work

iv always loved pro tools i used to have LE 8
but now.... im not so sure ..... pro tools is costly and i expect for it to work

please help