Do you have .NET 2.0 installed? Make sure it's up to date. You can also try disabling your anti-virus temporarily (even if it says it's safe, they can still sometimes interfere with things and cause a crash).
If it still doesn't work, you can try Landin's updater (in the downloads section) or use the manual install download; the manual one won't be as up-to-date, but it beats nothing.
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