How can I stop multiple error messages on login?

I keep receiving multiple messages on login to XP saying: "*.exe has encountered a problem and needs to close. We are sorry for the inconvenience." * changes in value maybe 8 or nine times. I havee tried to open tdsskiller and malware bytes pages and they are both blocked. Any ideas, clever people? I have also noticed that my computer is misbehaving in other quite subtle ways.

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