The rules of the internet are:
1. Never use the default client (dl something off sourceforge or whatever)
2. Open explorer.exe open->tools->folder options. Uncheck "hide extension for known file types"
3. Block anyone not in your addresslist.
4. Backup your photos, membership emails and e-receipt. (your 400GB of pr0n too if you cant live without it)
5. did you realy do 4? (Corollary: If your computer is stolen and you get a new from insurance, would you lose anything important? LFS license?)