Resolved Uncontrolable Scrolling

Am running Windows 7 64 bit and have been for awhile with no issues. All of the sudden when browsing in IE8 the screen starts scrolling down with out doing anything. I have a Logitech Trackball wireless with fresh batteries. I have even installed Firefox and still get this scrolling issue, also it is happening in Excel. I went to Logictech's site and loaded and installed their software without success so I removed it and went back to the standard driver. While I had Logitech's software installed there was a double down arrow as though you were pushing the scroll button on the mouse and if you push the up button the screen would scroll up with the double arrow up. You can move the wheel any direction to stop the motion but when you move the courser it will start scrolling again. I have scanned for virus with an up to date AVG with no results and there are no electronic gadgets near the wireless receiver. I have Googled searched and have tried various things as mentioned and this appears to be a problem but so far the things I have tried have brought no results and I am at a loss. My next step in my limited knowledge is to format C:\ but I don't want to do that. Any ideas??

David

 

Managed to dig up a wired mouse and all appears to be OK. I forgot how much I hate using a wired mouse. I checked on Logitech's web site but they are down for maintenance, just my luck...

Thanks, David

 

After playing with the wired mouse for awhile I decided to take the trackball apart and try to clean the down scroll button. Thinking it might one of those little carbon dot that make contact with 2 pad on a printed circuit. To my surprise it was an actual button/switch surface mounted on a PC board. I pushed the button a few times and looked a little closer and noticed a bunch of dust around the connections, where it came from who knows. I blew the dust away put it all back together and it worked normally. So I plugged it back into the original port and all is fine.

The only conclusion I can come to is that the dust was some how conductive enough to cause a short.