second that - time for a fresh install, much cleaner solution
its good practice to reinstall your system every ~6-12 months
My last XP install lasted 6 years before I bought a new comp and I ran months at a time between restarts. Never got slow. Well, got slower than a fresh install, but leveled out within a month. didn't get slower after that.
It's all about learning self-control and not spamming the "OK" button and "GOTTA HAVE MORE IE CONTROL BARS AND WIDGETS!!!"