I noticed that you are using an outdated XP SP2 and IE 7, both of which are not supported anymore. For security, you really should update to SP3 and IE8.
If you had kept your software up to date, this may have been prevented; this left you open to a huge security hole. I strongly suggest that you update as suggested in my quote above and YoKenny's post.
You can also check your other software with
free Secunia Software Inspector at
http://secunia.com/vulnerability_scanning/personal/. Many of us use it weekly since software is constantly changing and having obsolete software is another way for malware to sneak into your system. This site also gives you the vendor's direct download patch making it easy to fix.
Hopefully you have read the other thread that I posted earlier and the problems with ASC and IObit. MBAM does a much better job as do other security software than the 2 you have on your machine. As I mentioned earlier, some ASC versions also contain an AV which will conflict with other security software (like another AV). Since you are using the Pro version, I am assuming this is resident like your AV, which would be more concern for conflict to occur.
I am trying to make sure your machine is as protected as possible with up to date software that does not conflict with each other. Layering your lines of defense is one of the best ways to do this, but the software cannot conflict and yet you do not want to over do it either. MBAM is a great program to have as a back up. If you look at my Signature I also have a USB malware protector, something else may want to consider. Strengthening the browser you use (see my Signature as an example) is another method of adding security. And of course using common sense of safe browsing practices and email security.
Keep in mind that no one software is 100% guaranteed. There is no possibility that you obtained the malware from the Avast uninstaller as this comes from Avast and millions of people download this every day and millions are not getting infected with it. In addition, your problem began
prior to installing the Avast uninstaller utility tool when you first made your post. I believe you had this virus and this is what was causing your problems of your "Application Error / memory." Had you not installed Avira and I had you run more diagnostic tools, which was my next step, we would have seen your malware then could have removed it. So it is up to you if you would like to return to Avast since you have been happy with it in the past and our support forum is very responsive in helping people out with a variety of issues.
Please let me know if you have any questions. Thank you.