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Dmitry Tsarev, I got ur point, but I have tried all that I can do, including re installing pvx. I think I should contact a ptc person, and thanks for ur prompt responces. Take care.
I got the answer. Go to environment and set ][right click on my computer icon, then: Properties > Advanced/Environment > Environment Nariables > New] ptcpvx_height= <some val [may be height of your screen]> ptcpvx_width= <some val [may be width of your screen]> Restart. Done.