I like spybot, but not enough to pay for their advanced features.. everything gets too intrusive on your system resources and page loads and downloads drop in speed.. Especially when your system is already maxed doing boinc
lol.. But if it's a portable device going onto unprotected networks.. load that up!!! load everything up
I'm gonna give 360 security a try (
http://www.360totalsecurity.com/en/) and it's all free supposedly.. There's also one that free antivirus only.
**Update: I like the 360 total security, just make sure you don't let it remove boinc or Efmer boinc tasks/temp control from startup.. it doesn't know what they are, and man are they system hogs