Windows 7 cannot open com1

I have 6 computers Toshiba Tecra all bought to use the com port to communicate with data loggers. as provided by Toshiba, they work very well, as soon as they update of windows I get the message cannot open com 1, I have a scanner and nothing else is using the port. If I uninstall the driver of RTP com and reboot it all works, but it is temporary when you restart is not open, I guess it's a windows update issue 7 and follow the procedure to install updates one at a time, but still without success. Windows 7 pro 32 bit as computers alll provided behave the same way. any suggestions?
I tried many programs of comms and the fertile, one for the data recorders that give the same result in train to test with hyper terminal.
All updates of drivers and bios are up-to-date Toshiba cannot but feel it should be a problem to update.

Thanks Dave K

Hi and thanks for the suggestion, but it's a physical series RS232 port so not concerned by the firewall.
I solved the problem which turns out be due to an update to Adobe acrobat reassign the PDF printer to com1. Microsoft to not update as I thought.

Thanks again.

Tags: Windows

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