Virus warning on a .txt file? Sounds odd, but I'll take your advice and do a full PC scan. Sorry about that.
As per the issue I was having, there was no issue at all. I just had no comm signal to Kerbin, and since I hadn't being playing since a few months, I didn't know that you need comm to fly an automated rocket.
Thank you anyway.
EDIT: Chrome gives me a warning if I try to download the log file I uploaded yesterday, but I scanned it with Avast and it found no viruses. Really odd.