I'm thankful I haven't had any issues, but I, too, procrastinated like crazy due to the holiday. Sometimes it's good to be a little behind.
I've got to agree with "thenetavenger", however. I know all too well what poorly-written security software can do to a computer. Oddly, it's typically the store-bought, well-known "security suites" that do the most damamge. I've been running Avast! for years on XP, Vista, and Win7 machines with no problems whatsoever. Just goes to show that sometimes the best products aren't backed by large companies, but by a small group of people who really care about what they're doing.