HELP - Something infected us and we can't fix it

I've downloaded everything - Anti-Spyware, Anti Malware, Hijack This and many more that have been suggested.

I can't open ANY of them and with each get a different error message.

I am getting tons of pop ups and Internet Explorer will only open to Porn sites. I can get online with Mozilla but can't use my email to send things and can't get rid of pop ups. I also can't access my task manager.

Oh yea - I don't know how to do too much.

PLEASE HELP!

Please download the current version of HijackThis from HERE

• Double click and run the installer.
  
• It will install to C:\Program Files\Trend Micro\HijackThis\hijackthis.exe
  
• After installing, you should get the user agreement, press accept and Hijack This will run.
  
• Select Do a system scan and save a log file. This will open a notepad file of everything Hijack This found, copy and paste it back here.