Hi aslee, welcome to DaniWeb :D
This first part if kind of a guess, so you may not find any of the files listed.
Get the Pocket Killbox from here:
http://bleepingcomputer.com/files/spyware/KillBox.zip
Unzip the file to your desktop.
Go offline until this is completed (you may wish to print these instructions).
Boot into Safe Mode and do a search for these files and delete any instances found:
param32.dll
guninst.exe
popup_bl.dll
systr.dll
svrhost.exe
If any could not be deleted, (most likely param32.dll), run Pocket Killbox and paste the full file path of file in the box and click on Delete on Reboot. Click on the button with the red circle and an X in the middle; you will get a message saying File will be deleted on next reboot, Process and Reboot now?, Click Yes to reboot. (Note: the 'file path' will be something like C:\WINDOWS\System32\param32.dll)
Delete any icons from your desktop that you didn't put there, and empty your Recycle Bin.
Scan with hijackthis, and have it fix:
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.findyourcouple.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.findyourcouple.com
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant = http://www.findyourcouple.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Local Page = http://www.findyourcouple.com
O3 - Toolbar: (no name) - {2CDE1A7D-A478-4291-BF31-E1B4C16F92EB} - (no file)
O9 - Extra button: Related - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
O9 - Extra 'Tools' menuitem: Show &Related Links - {c95fe080-8f5d-11d2-a20b-00aa003c157a} - C:\WINNT\web\related.htm
Be sure all windows, other then hijackthis, are closed before hitting Fix checked.
Go to C:\WINNT\web and delete related.htm
Reboot again, close any open browser windows, scan with hijackthis, and post a new log please. Let us know if you found any of those files listed near the beginning and if you're still being hijacked.