Web Browser Opens Up Random Sites?

I'm having the same issues as BP96. I've ran AVG, Malwarebytes, Regcure, Hijackthis, MSE... everything seems "clean." However, my browsers (IE8 & Google Chrome) randomly open web pages. It's really annoying and slowing my memory.

The first time this happened (about 2-3 weeks ago), AVG detected trojans in svchost.exe and explorer.exe but could not clean them. Then a friend of mine helped me run Hijackthis (it is a little too technical for me). Now, my antiviruses, antispyware/malware do not detect any single "virus," yet my issue persists.

HELP!

I'm not a very techy person, so please be kind. :)
 

My Computer

OS
Windows XP Home
Hi chadpink, you should start your own topic. This is an old one and 3 pages long. You'll get faster help in a new topic ;)
 

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
PSU
Rocketfish 700 W
Case
G.Skill Gigabyte Chassis
Keyboard
Standard PS/2 Keyboard
Mouse
Microsoft PS/2 Mouse
Internet Speed
DSL
Antivirus
Avira Internet Security
Browser
IE 11
Other Info
ATI HDMI Audio
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