Noob question about smxi and its aftermath

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http://crunchbang.org – I'm totally new to Linux, but I like to learn the hardway I guess.Yesterday I ran smxi to get the newest kernel version and today after booting I noticed that my wi-fi drivers needed to be reinstalled (I did not notice yesterday since wireless internet continued to work on my current session after running smxi and I assumed they were working fine)I need a guide for dummies on what to do now, I'm writing this from a wired connection. How do I reinstall the wi-fi driver? I guess I could just reinstall the whole OS again but that defeats the whole purpose of updating to the newest kerne (HowTos)