Voters this year will use iVotronic voting machines. Through a Channel 6 News investigation, we found that every state which uses this type of voting machine has reported some kind of computer glitch during voting.

Problems have been reported in Arkansas, Florida, Indiana, North Carolina, South Carolina and Texas. But because of their user-friendly system, the iVotronic system was still chosen locally.

However, many are concerned about the validity of the machines in the long run.

For example, according to VotersUnite.org and several Florida newspapers, absentee ballots were combined with electronic votes in Orange County during the 2004 presidential election. Further, the machine did not count 8,400 votes. A report said John Kerry beat President Bush by over 9,000 votes, but it was actually only 827 votes.

However, a spokesman for the company which sells the machines said, in many cases, it's human error - not the machines - that's the problem.

Ken Fields of ES&S said the issue was identified as part of the process before the results were ever made official.

"It was addressed, resolved and it was clear all the votes were counted accurately," Fields said.

He added, "The testing and certification processes are rigorous and they ensure the system meet federal and state requirements on a number of fronts, including reliability and accuracy."

After the elections in Vanderburgh County, Ind., the iVotronic voting machines recorded "phantom ballots," meaning more ballots were counted than the number of people signed in to vote. Fields contends this problem was caused by poll workers.

In several states, elections officials reported that the voting machines changed the outcome.

One Florida county reported, once the absentee tally hit 32,500, the machine actually began subtracting votes. There was a similar situation in North Carolina. Fortunately, that problem was resolved before the results were made official.

Still, Fred Smith of the Cambria County Office of Elections said he is confident that the elections will go smoothly.

If the electricity goes out or the machine shuts down for some reason, each unit has a self-contained battery system of six to eight hours of continuing voting. There are also three memory cards inside to save information if the machine shuts down.

For persons with disabilities, there are assistance forms in the supply boxes at each polling location. For the visually impaired, there is Braille on the machine along with headphones for an audio ballot.

And at the end of the day, if the votes are close in one category, paper ballots can still be printed for a recount.

The voting machines are currently in public libraries and courthouses so voters can go through a test run before heading to the polls.

For step-by-step visual instructions on how to use the machines, please see our slideshow.