Very annoying virus/malware/trojan

Recently i had been on the web and downloaded a file as soon as i ran it many things started to happen first i got a bunch of errors saying file is corrupted unable to run press ok to terminate or cancel to debug no matter what i press it came back then my internet opend and it took me to random pages AFTER that my internet stopped working watsoever and porn files got downloaded to my desktop (wtf?) now i cant go to internet so i thought no problem and downloaded anti-malwarebytes after that deleted the infections i restarted my computer i get a bunch of errors all saying file is corrupt ok to terminate cancel to debug around 3-4 of these then my desktop background load but the desktop no icons nothing. Next i noticed something in taskmanager ther had been a process called System Idle Process (dont skip through this part) run by System BUT it only was 28k i cant start up internet i cant open cmd i cant open regedit i cant start explorer.exe and im on a diff computer looking for help

Last edited by mfgootcagfys on 25th September 2009, 3:26 pm; edited 1 time in total

One more thing this is the exact error
The instruction at "0x00610b21" reference memory at "0x00610b21". The memory could not be written.
Press OK to terminate the program
Press CANCEL to debug the program

Update on problem i managed to logon to my desktop and am deleting all the viruses i still cant get rid of the task and dont have internet when i type ipconfig it tells me internal error unable to query host name?? what is this please reply

Hello.
Can you download tools from a working machine, then transfer them via USB?

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.