Can't get my wireless working after an update

Hello, I recently just got my toshiba laptop back as my hard drive became corrupted, from the shop. When I loaded the comp up it had a disc in that asked me to update windows on the comp. Halfway through set up it told me it needed the internet. I then had to install my talk talk. after this the laptop was working fine and so was the wireless. A few days later I put the disk back in to complete the setup of windows 7 home professional on the laptop and it has wiped everything. It updated itself and when the talk talk was yet again reinstalled I realised I no longer had a wireless connection. I could only connect via a wire. Please could someone tell me how to fix this