My garmin 255w tells me to make right turns when there is no roads. It also tells me to make right turn at a street when I should be making left. The simulated trip freezes. My computer I think messed up my files, when updating. I bought a new garmin shortly after this problem and when I updated it, it didn't work anymore and I returned it to Best Buy. I reinstalled operating system in computer and it works fine. Mean while I have a good 255w with corrupt files and would like to get it to work properly. What can I do? Contacted garmin and they could not help me.