Avoid shady “driver updater” sites. Use these instead:
Q: Can I use a 64-bit driver on my 32-bit system? A: No, you need a 32-bit driver specifically designed for your system. 802.11n wifi driver for windows 7 32-bit
If the internal card driver is impossible to find, a $10 USB 802.11n adapter with Windows 7 32-bit drivers (like Panda, TP-Link TL-WN725N, or Edimax) is a quick fix. Avoid shady “driver updater” sites
Need a 802.11n WiFi Driver for Windows 7 32-bit? Here’s What Works 802.11n wifi driver for windows 7 32-bit
This is the most widespread chipset for generic "Nano" USB WiFi adapters. Look for drivers labeled: