JS:ScriptIP-inf[Trj] help

Hi. I just searched the forum and decided to register to ask you about this. Three questions, actually…

Avast (4.8 Home Edition) detected JS:ScriptIP-inf[Trj] in a zip file I downloaded it. Before I open anything, I always right-click the file and have Avast check it for me, so that’s how it was detected. But I wonder why it didn’t warn me in the middle of the download process? Because it did that before and I don’t get why it didn’t this time. The zip file was not password-protected and I didn’t change my Avast preferences. Is there a way I can make Avast always warn me in the middle of the download process?..

Ok, upon detection, I told Avast to delete the infected file (as opposed to quarantine it) and then I think there were some options in the alert window about “delete on boot/delete all” or something like that? I think it was all checked… Sorry, my Avast is in portuguese and I’m trying to remember as much as possible…
After I hit the “ok” on the Avast alert window and it closed, I proceeded to delete the infected zip file and then again from the recycle bin.
After that, I ran a complete Avast scan and it didn’t say anything else.
BUT… I did NOT reboot my computer yet.
I’m wondering if I did the right thing (or everything right) and if it’s safe to reboot?

I’m so sorry and I know this might sound a bit lame, but I’m not used to this (hardly ever happens) and now I’m wondering if anything might happen once I reboot… Especially since I don’t know what this JS:ScriptIP-inf[Trj] is supposed to do?.. Can I find that kind of information on the Avast website or only here in the forums? Anywhere else safe and reliable?..

Thanks much, your help appreciated.

Are you browsing the internet during that time?

So far, what you did is great and seems like there wont be any spread of infection.