You may have 'adware' or 'foistware' that most Anti-virus products won't detect.
Download AdWareCleaner AdwCleaner Download to your desktop
1.Right-click on adwcleaner.exe and select Run As Administrator to launch the application.
2.Click on Delete button.
3.Confirm each time with OK.
4.Your computer will be rebooted automatically. A text file will open after the restart. Please post the content of that logfile in your reply.
Note: You can find the logfile at C:\AdwCleaner[Sn].txt as well - n is the order number.
My Computer
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Bruce ... somewhere in his 40's
OS
Windows 7 Ultimate 32bit SP1
CPU
Intel(R) Core(TM)2 Quad CPU @ 2.40GHz, 2400 MHz
Motherboard
INTEL/D975XBX2
Memory
4 GB
Graphics Card(s)
ATI Radeon HD 2600 Pro
Monitor(s) Displays
Samsung SyncMaster 914v
Screen Resolution
1280 x 1024
Hard Drives
2/500GB each ... ST3500630AS ATA Device.
One is not connected
# AdwCleaner v2.300 - Logfile created 05/03/2013 at 17:17:31
# Updated 28/04/2013 by Xplode
# Operating system : Windows 7 Home Premium Service Pack 1 (64 bits)
# User : al - AL-PC
# Boot Mode : Normal
# Running from : C:\Users\al\Downloads\AdwCleaner (1).exe
# Option [Delete]