How can I prevent rogue software from installing itself via Firefox on my system?

Question

I don't know if this malware is exploiting a hole in Win7 or Firefox or both.
So bear with me in my description. I am trying to ascertain if there are Win 7 security settings or configuration changes I can make to eliminate this. Or are there Firefox configuration settings I can change to prevent this or both. Did not find any help articles that seemed to address this from the search arguments I thought to use.
In the last two weeks I have had two different "security product" windows activate on my Win7 Pro system. Somehow they prevented my starting anything else such as task manager. My AV application detected attempt to create outgoing internet connection in both instances. In either case I ceased using my system as soon as the malware Window activated. I was burned by a third party cookie exploit last year. If you clicked anything, you were toast, such as a "do you really want to navigate away from this page?" warnings. Didn't get one of these messages this time with either of these. But in both instances, registry entries were created for this malware and it installed itself in the following directory path, C:\users\{myID}\appdata\local\temp\ as dtjupjnml\lcuatursjmo.exe s well as registry entries under dtjupjnml and lcuatursjmo after searching with the regedit FIND feature. I didn't recall the names from the first instance, but it installed exactly the same way.
This did not come from an e-mail attachment or link. I don't do those.

Answer 1

Do a malware check with some malware scan programs.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of the database before doing a scan.<br />
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]