Thank you for all replies. I am going to buy just a computer with
Windows. There are now sometimes some problems with the drivers of
the devices, which are not sometimes supported by Windows XP, then there
must be installed Vista. On the other hand, Vista takes much memory and
other computer resources and I have heard that sometimes it runs
slowly. Since, as Robert Dodier has written in a post to me, there are
not problems with Maxima vs Vista, then I hope that it will be OK.
Best wishes
Lukasz Stepien