Best program for XP registry repair and spyware elimination

[davester]

A friend just brought me her laptop which has slowed to a crawl. I ran a free registry analysis program (XP Medic) and it came up with tons of errors. I'm wondering which registry repair program is best. There are zillions of them and most cost around $30. Which are the best ones? Better yet, which are the best free ones?

Also, she has Virusscan, which I just updated, but I'm wondering what the best anti-spyware programs are.

Any thoughts?