The VGN-270P appears to be a pre-Vista release. It is old, non driver supported hardare that gives Vista, or Windows 7 in this case, problems. Things like your sound, ethernet, wireless and possibly other driver dependent hardwaqre components may not cooperate with W7. I have a similiar old Intel Pentium M notebook and I will leave XP on there, the thing is so slow. But on the other hand, I have an ancient socket 939 system running Windows 7 64 and did not have to instal a single system driver! I would think the notebook you have would run like a snail even with XP. Much less Windows 7. Back up with Acronis True Image and go for it!