Is it possible for you to get the downloads from another computer and copy it here? If so, do it now.
If that computer could burn CDs also, I want you to get the following program:
Let's use a program to scan for any trojans that may exist. Download
TDS-3. Learn how to use it
here. Make sure to update it after you installed it. You can get the manual updates
here. When you launch the program, it will scan your memory for running processes. This will take less than 30 seconds. Next go to
System Testing on the menu and choose
Full System Scan. After that's finished, post the log file by selecting everything on the top pane (select from bottom to top). If any alarms are found, it will be listed in the bottom window. Please copy and paste that here also if it applies.
If that computer can't burn CDs, then just get the other programs and put it on a floppy (they will fit).
Give us the log when you are ready. Hopefully whatever is preventing these programs from running, won't do the same with HijackThis.
If it does, try this:
Open up HijackThis but don't run it yet. Hit ctrl+alt+del and then go to the processes tab. Now look for explorer.exe and click on it. Then click on End Process. Now run HijackThis scan. Save the log. Hit ctrl+alt+del and go to File->New Task and type in
explorer and hit OK. Post that log here.
Come to think of it, if the above will work that way, you can probably run Ad-aware and Microsoft Antispyware that way also. Just open them first, but don't run it yet. Then end explorer.exe and run those programs.