GPS systems are all the rage nowadays but you could be in for a surprise if you picked up a TomTom GPS device. TomTom International confirmed on Monday that some of its latest Go 910 devices have shipped with a virus preinstalled. The infected systems were all manufactured during a one-week period around October 2006, TomTom said in a statement posted to its Web site on Monday. The affected systems are running version 6.51 of the TomTom software.