I have Windows 7 Pro 64-bit and it was upgraded from Windows 7 Home 64-bit.
I found the HIJACK.DISPLAYPROPERTIES in the results of a MBAM scan. I did the scan because my laptop was slow and freezing all the time. It was a full scan, because I was hoping to find an answer to my problem. I considered re-installing (not upgrading, wiping out) but quit with the power button because I realised that Sony had installed software that you couldn't get anywhere else, and I liked it. Is this my answer? (I think not.) Anyway, please do help!