Firefox And installers

Earlier i tried installing some programs but when i got to the install it stopped and it said it couldnt reach "%appdata%" or "userappdata",i had no problems installing untill now. i Also cant open/run firefox at all So im Wondering if someone can tell me if this has anything to do with the ESS Firewall or Something related

 

what progs were you trying to install and what is the exact error message also what os

 

i Was trying To install Malwarebytes, and some other anti-malware.
Running Windows Vista 64-bit
+For some reason i cant use Firefox, i Re-installed but nothing worked

 

http://i218.photobucket.com/albums/cc197/PWNAGEX14/sfgsf.jpg
This is The Problem. As u Can See i tried installing ventrilo

 

Check your enviroment variables under system ... see for APPDATA

usualy - %APPDATA% - C:\Users\(username}\AppData\Roaming

Enviroment variables

 

Found the Folder, Now what?

 

i tried this:

1. Right click on the [username] folder located in C:/Users/[username] then go to properties
2. Click the security tab
3. Click advanced
4. Click the owner tab
5. Click edit
6. Highlight your user name and check the replace owner on subcontainers and objects checkbox, click apply then ok. Then press ok on all of the other windows to exit out of them.
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No luck, i still get the same problem