Can't live without algebra. Combinatorics is critical for computer science. Statistics is very helpful.
Unless you go into scientific computing, you'll almost never run in to a computing problem for which calculus gives a boost. The math computers work with just doesn't relate.
Differential equations was my bane as well. I failed it several times and ended up not correcting an error when I transferred schools and they assigned credit for it as a result of a different course I'd taken. Now I earn near $140k and I'm the go-to guy at the office when there's a particularly complex data handling or networking problem to be solved.