Check to see if your device manager has any ? icons next to them if you do that means theres some hardware which doesn't have working drivers. Hence the suggestion above is correct.
I'm just gonna put this one out there as well so dun flame me
did u check to see if u turned on ur wireless
if you did than the other reason i can think of is one of the programs you deleted managed your wireless settings. So go to control panel and turn the default wireless manager back on.