It may be slightly difficult to turn off without actually knowing the name of the program.
What version of windows are you using? 7?
Assuming the program that's running is an active process (which it probably is) you should be able to hit ctrl+alt+del and open up the task manager. There will be a list of active processes running, and hopefully your IP blocker will have a name that makes sense on that list. If you can use that to figure out the name of the program, you can then go to your control panel and do add/remove programs to uninstall it. In fact, using the add/remove programs utility, you might be able to just find the IP blocking program listed there without even using task manager.
Presumably if it's uninstalled you'll not have this problem any longer.
Many internet "utilities" targeted at less experienced users are actually BS, though, so it's very likely (no offense) your IP blocking program may in itself be malicious. This may make it harder to find/remove.
If you're having issues with that, I'd recommend a real (not what comes on your computer) antivirus, the best of which is eset nod. It's quite affordable.
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