I assume that you're based in the U.S.
I'm not a lawyer, and I imagine that these kinds of things vary from state to state, but here's what I know. Common sense dictates that you should verify all of this, however.
First, you can always be sued. A civil suit can be levied for any claim of damages exceeding $20. This is a constitutional provision, so it doesn't vary from state to state. Whether or not the plaintif will win is another question entirely.
I used to fix computers when I went to college and I got scared once that a client would try to sue me. I had an informal disclaimer (i.e., a document that was signed by the client that essentially stated I was not liable for any and all damages), but I didn't know what such things were worth. Fortunately, I did MMA with a guy who was a practicing corporate attorney. He told me the following:
- Such terms of agreement, though not legally binding, go a hell of a long way in determining a tort in a civil suit. In other words, having a EULA should help insulate you from litigious worries.
- The only thing that you can't really disclaim is negligence. In other words, if you screw up someone's computer because of a blatantly careless error, or if the client can convince the judge/jury that you didn't have reasonable quality control in place (e.g., absence of a bug tracker), you could be liable.
This friend of mine also said that while it's extremely difficult to disclaim negligence, it doesn't hurt to try. Just explicitly state that you disclaim all responsibility from any adverse effects of installing, executing, or uninstalling the software, including those arising from negligence.
I hope this helps!