WeatherBug is related to adware and, in my opinion, should be removed. You can decide for yourself; here are a couple of links:
http://sarc.com/avcenter/venc/data/adware.weathercast.html
http://www.auditmypc.com/process/weather.asp
If you decide to uninstall it, go to Add/Remove Programs in your Control Panel and remove WeatherBug
Regardless of your decision regarding WeatherBug, scan with HJT and have it fix the following entries:
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Bar = http://red.clientapps.yahoo.com/cus...rch/search.html
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://red.clientapps.yahoo.com/cus...://my.yahoo.com
O2 - BHO: (no name) - {FDD3B846-8D59-4ffb-8758-209B6AD74ACC} - (no file)
And these only if you don't want WeatherBug:
O4 - HKCU\..\Run: [Weather] C:\Program Files\AWS\WeatherBug\Weather.exe 1
O16 - DPF: {2B96D5CC-C5B5-49A5-A69D-CC0A30F9028C} (MiniBugTransporterX Class) - http://wdownload.weatherbug.com/min...ransporter.cab?
Close all windows other than HJT before hitting the Fix button
Last step, again only if you don't want WeatherBug:
Reboot into Safe Mode
Go to C:\Program Files\AWS and delete the WeatherBug folder
Reboot normally
Close all browser windows, scan with HJT and post a new log