Gonna need more detail since there isn't much in your OP.
What sort of connection issues? Are you able to connect to wifi at all? Do networks show up? Is the wifi driver installed?
I'd suggest trying to install a different (newer?) wifi driver from the wifi card manufacturer's site. Lookup the brand/model # of your wifi chip through Device Manager and look at the Driver Tab in the properties of it to see what the date/version is. Look on the manufacturer's site and see if a newer one is available.
I used device mgr and right clicked on the adapter and it said i have the most current driver there is. My isp rolled back a version and that didnt help either. Any other ideas?
mediatek mt7630 802.11bgn driver
after a few mins connection drops causing yellow ! on network icon in system tray.