When I've tried to process the Trojan, I have had 70 GB of free space in the disk. Also I've got 4 GB of RAM that I think should be enough.
About Windows defender, it is installed and lets me know that my computer is running normally.
I tried to use Ad-Aware (Aniversary Edition) yesterday to deal with the Trojan, and he or didn't find it, or couldn't process it (eventough it (Ad-Aware) said that he managed to fix all of the problems that he found).
I won't blame Avast, but when I tested it on a system that isn't very powerful (P4 2.8, Vista 32-bit and 2 GB), it slowed down the computer quite a bit and I quickly uninstalled it. I noticed the same issue on an even less powerful laptop. Why not disable Avast for a few minutes to see if it helps?
I'm sure that the problem isn't with Avast. I have a good computer (I think) 4 GB 160 GB internal disk, Core 2 duo E4500. before the opening of the installation file that was infected (the game's installation file, as written in the main post) the computer worked just fine, afterwards it started to work slowly, and all the sympthoms I mentioned before.
Probably because it's not a Trojan then. You could just try to delete it yourself I guess. I think Trojans are one of the few forms of malware that can simply be deleted, unlike viruses. Don't quote me on that though.
Avast gives you 3 options. 1-Move to Chest, which doesn't work.
2-Move to Recycle Bin, I didn't try this. 3-Delete.
I deleted it and have had no problems so far. Avast said it had been deleted successfully.