HP scanner doesn't work well eventhough it turns on?

my HP scanner used to work well but now it doesn't work. every time I try to scan something it get stuck and my computer gets very slow then says 'failed to communicate. check it's plugged properly etc;" but I'm sure I plug it well. so such times i have to turn off the scanner and restart the... show more my HP scanner used to work well but now it doesn't work. every time I try to scan something it get stuck and my computer gets very slow then says 'failed to communicate. check it's plugged properly etc;" but I'm sure I plug it well. so such times i have to turn off the scanner and restart the computer cuz it slows computer down or freeze it.
so what should I do? should i reinstall the program? will it fix it?
[sorry for my english]
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