Hya Tom, welcome to PCHF.
First look in your add/remove programs for any of these:
Oin
OuterInfo
Yazzle by OIN
Cowabanga by OIN
PuritySCAN By OIN
Snowballwars by OIN
ipwins
Zolero
Tizzletalk
MediaTickets
Forethought
Quicklinks
or anything similar with Oin or Outerinfo in it.
If any of those names are found, click on it, and click remove.
Reboot and delete this folder if found:
C:\Program Files\PurityScan
If not listed, download and run this uninstaller:
http://www.outerinfo.com/OiUninstaller.exe
Tutorial for the uninstaller if needed:
Uninstaller
Reboot when done and delete this folder if found:
C:\Program Files\PurityScan
Run
HijackThis , select to do a "system scan only" and then place a check beside each of the following:
R3 - URLSearchHook: (no name) - {F394FB63-3182-1076-A4AB-6C1347DD6DE2} - C:\WINDOWS\System32\tfxshde.dll
R3 - URLSearchHook: (no name) - _{CFBFAE00-17A6-11D0-99CB-00C04FD64497} - (no file)
O2 - BHO: (no name) - {06754ADA-1B20-4CF0-B9B1-86A721028AC1} - C:\WINDOWS\System32\yabaw.dll (file missing)
O2 - BHO: (no name) - {F394FB63-3182-1076-A4AB-6C1347DD6DE2} - C:\WINDOWS\System32\tfxshde.dll
O20 - Winlogon Notify: windvw32 - windvw32.dll (file missing)
O20 - Winlogon Notify: yabaw - C:\WINDOWS\System32\yabaw.dll (file missing)
Now first close all windows and browsers other then HiJackThis , then click
fix checked and close HijackThis.
Manually delete this file:
C:\WINDOWS\System32\
tfxshde.dll
Reboot your pc, and post a new
HJT log please.