if you dont got any wireless network tabs or any entry of wireless nic in networkneighbourhood/my network places, then it looks like you dont got any wifi card installed.
Could mean two things
1. you just dont got any wifi hardware in youre pc
2. the wifi hardware isnt installed, best wat to check is to goto device manager in control panel and check if there any unkown devices listed there, if so, these might be youre wireless hardware.