Hey,
If you are going to university for Computer Science you really don't have to know any language, so if you don't have the time don't worry about it. They generally start out with the basics and work your way up. If you really want to learn something though I would suggest Java. Java's got a lot of great things going for it, it's OO, forgiving and powerful. Plus it's doesn't hold your hand like VB does and it also doesn't let you chop your own head off like C. An added bonus is the API is right there on the website for reference so you don't have to go wadding through tons of shit to find a good tutorial.
If you are going to university for Computer Science you really don't have to know any language, so if you don't have the time don't worry about it. They generally start out with the basics and work your way up. If you really want to learn something though I would suggest Java. Java's got a lot of great things going for it, it's OO, forgiving and powerful. Plus it's doesn't hold your hand like VB does and it also doesn't let you chop your own head off like C. An added bonus is the API is right there on the website for reference so you don't have to go wadding through tons of shit to find a good tutorial.