wireless connection dropouts

On one of my machines xp sp3 wireless connection has several issues (win7 fine). First it states network unsecure (wpa enabled) then disconnects when I try to connect sometimes it states no networks available! Reboot usually solves it. I have done extensive scans no malware detected also ie8 sometimes opens with about:blank. Any ideas appreciated.

I have now found that cis was intermittently blocking acer epower management therefore blocking the wlan. I’ve now put epower into trusted files should I put my wireless driver there as well?