I have gotten this blue screen message a couple of times the past week. About this same period my computer icon has disappeared from the network neighborhood but I am still able to connect to others on the network, but they cannot connect to me. My desktop items have also been changing locations from the last start up. The computer also freezes, the cursor is slow to move and will at times flutter about the screen and open a windows toolbar box. This behavior happened before but ceased when a new hard drive was installed, which was about 6 weeks ago. The computer has also started hanging on shut down.

Thank you in advance.