I had already removed and reinstalled the driver, as well as downloading a fresh driver and installing that instead, as mentioned in my original post. Neither thing worked. I saw on another forum that someone who also had this problem ended up getting a new card and after installing that, it worked fine immediately. So that is what I did. I bought a new WIFI card off of Amazon.  I installed it yesterday and it connected immediately and has been working great thus far!
Hello, I've been going crazy for a whole day searching and trying what seems like 1000 different things to get the wifi working and nothing is working. My wifi adapter is Intel Wifi Link 5100 AGN My laptop was connected yesterday morning. The connection went away, so I put the computer to sleep and woke it back up again (since in the past this has helped). That worked, temporarily, then it went out again. I put it to sleep again for a little longer, woke it up - it worked then went out again. This time I thought I just need to restart the computer. So I did, and since then I have not been able to reconnect! Things I've tried: Please someone help!! I feel like I have tried everything. I'm sure I'm leaving out some other thing I've tried. Not to mention I've restarted the computer about a 100 times now. Thanks in advance. 
Dell Inspiron 1750 Laptop stopped connecting to WIFI. It's been a full day now. 
Network shows - won't connect. Ethernet cable works but NO WIFI. All other 
devices in house connect fine wirelessly - PLEASE HELP!