Removed a trojan off but now I'm getting "This file does not have a program associated with it for performing this action"

Please provide more details, What program or programs are you trying to open when you get that message? The more details you provide the better chances to get a solution. Thank you.

There are a lot of malware variants that could be called 'rogue trojans'.
Look through the list here and see if you recognize any of the names:
http://www.bleepingcomputer.com/virus-removal/

If you find it, follow the exact instructions as written by "Grinler".

You can also try the various menu options in "RogueKiller".
See my EE Articles at these links:

https://www.experts-exchange.com/A_4922.html (Rogue-Killer-What-a-great-name)
https://www.experts-exchange.com/A_5124.html (Stop-the-Bleeding-First-Aid-for-Malware)
https://www.experts-exchange.com/A_1940.html (Basic Malware Troubleshooting)

@WalrusSoup,
Probably best to post your Registry fix as a "Text" file and let the user view the instructions.
We've had some past problems with downloaded executables and .reg files.

@younghv
Ok, thank you for letting me know. I assume that this is the proper registry fix since rogue trojans often replace the registry entry for opening .exe files so it, in fact, opens the virus once again. I will make sure to post the registry fixes in .TXT format from now on with instructions on how to save as a .reg.

:)
I'm a little paranoid about downloading anything, but if your file looks anything like what I attaching as "Code", it will be what I've been using for all of these variants.

BTW - Welcome to EE! We're always looking for a few good Experts.

Windows Registry Editor Version 5.00

[-HKEY_CLASSES_ROOT\.exe\shell]

[-HKEY_CLASSES_ROOT\.exe\DefaultIcon]

[HKEY_CLASSES_ROOT\.exe]
@="exefile"

[HKEY_CLASSES_ROOT\exefile]
"Content Type"=-

[HKEY_CLASSES_ROOT\exefile\shell\open\command]
@="\"%1\" %*"
"IsolatedCommand"=-

[HKEY_CLASSES_ROOT\exefile\shell\runas\command]
"IsolatedCommand"=-

[HKEY_CLASSES_ROOT\.bat]
@="batfile"

[HKEY_CLASSES_ROOT\batfile\shell\open\command]
@="\"%1\" %*"

[-HKEY_CURRENT_USER\SOFTWARE\Classes\.exe]

[-HKEY_CURRENT_USER\Software\Classes\exefile]

[-HKEY_CLASSES_ROOT\secfile]

[-HKEY_CURRENT_USER\Software\Classes\secfile]

[-HKEY_CLASSES_ROOT\pezfile]

[-HKEY_CURRENT_USER\Software\Classes\pezfile]

[-HKEY_CLASSES_ROOT\sezfile]

[-HKEY_CURRENT_USER\Software\Classes\sezfile]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FIREFOX.EXE\shell\open\command]
@="firefox.exe"
 
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FIREFOX.EXE\shell\safemode\command]
@="firefox.exe"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\IEXPLORE.EXE\shell\open\command]
@="iexplore.exe"

Select allOpen in new window

I think this tool might do the same correction http://www.winhelponline.com/exefix_xp.com

Thanks WalrusSoup
This is all I needed, worked like a charm