Wireless N300 PCI Adapter not working, please help?

I have an Encore ENLWI-NX2 wireless card, and my friend helped me install it and it has been working for a long time now. But today another friend help me set up some stuff in msconfig and I did a restart and now it doesn't work at all. It says something about the 4 and 6 protocols but those are set, and another thing about it's drivers not working. If anyone has any clue on how I can get it working again that would be awesome. Oh and I have no idea about this computer stuff so make sure it's info a noob can understand xD