Start off by cleaning out with the ATF-Cleaner...just click on the link, download and install.
Double click to open the program. Place a checkmark in Select All. Then click the Empty Selected button.
Next go up to the top of ATF-Cleaner and click on Firefox. Place a checkmark in Select All.
You will receive a box asking if you wish to delete your Firefox passwords. You may click NO.
Once you have done that then Click Empty Selected.
Once the program has finished, all of this takes just a couple minutes, then Reboot the computer.
Go back online and see if you can access the pages. If not, then follow the directions HERE
for the downloading, location and running of HiJackThis. Do a Full Scan with it. Save the log and post it back here. I will take a look and see what I think.
Judy