laptop wont connect to wifi. windows 7 compaq C700

[#1]

was working yesterday. I have not changed anything.

any ideas how to fix? thanks.

[#2]

You are gonna have to give alot more details

[#3]

I think i solved it. I changed the router to use 802.11n performance mode for my mac to get faster speeds. but my old pc laptop NIC card is 802.11 b/g... so Im guessing that is why the pc wont connect to wifi now?

[#4 · Accepted solution]

Yes, that is the downside of performance mode.  You will either have to revert to n and g mode which will affect the performance of the N devices or introduce a G mode wap, or of course connect by wire.