Firefox stall and crash when adding or downloading any files

Question

Firefox will stall and crash after attempting to add or download any kind of files. I have also note that when highlighted the words in the boxes under the top of the screen menus File, Edit, Tools and Help will look like frayed, this will not happen with the menus View, History and Bookmarks where the words are solid and clear.
I recently reinstalled Firefox and the program has created a Old Firefox Data in my desktop.
The last version I had +/- two years was also having a similar problem plus a total freeze and crash by going to Options, which does not happen anymore.
Firefox 22
Windows XP Media Center Edition SP3

Answer 1

Although always very conscious of security in my pc, two years ago I have a bug trying to do some damage in this system. After some fight and the help of some online scanners, TDSSKiller and even Combo Fix, I tough I got ready of the problem; nevertheless I have to deleted Firefox because maybe it was compromise beyond the point of fixing.
This days find me reinstalling Firefox, I thought that furthers updates will have work for a stronger program and a clean running.
I have always like Firefox way above any other browser; is not as intrusive as others and reacts fairly fast (plus give me more options that the main stream and corporate ones).
This computer runs now with:
AVG Antivirus Free Edition 2013,
Spybot w/ Tea Timer (for the registry),
SuperAntiSpyware,
Malwarebites' Anti-Malware,
Windows Defender,
Zone Alarm (for firewall)
I try to run them often, even in safe mode when possible.
Ideato, if you are sure this is a malware related issue I will do as suggested at the end of this article that you point out (Troubleshoot Firefox issues caused by malware) and go to see the Pros at Bleeping Computer Forums, once they are sure I don't have anything of risk I come back here for the follow up.
What you think?
Thanks, and thanks David too...