Troubleshooting a fairly new HP laptop. Had been infected with a virus. Cleaned it all up but was experiencing erratic mouse behavior. The customer claimed the behavior started when he got hit with infection. While the pointer itself moves fine the left and right mouse buttons intermittently act like they are being held down causing the pointer to drag and highlight everything in site. At other times the buttons do nothing at all. At other times the left mouse button triggers a rightclick menu. And at other moments all mouse control is fine. This occurs equally on the touchpad or when using an external USB mouse. I tried disabling the touchpad completely but the problem still occurs when using the external mouse. I tried updating the sypatics touchpad driver but that made no difference either. I finally resorted to wiping and completely reinstalling windows but the problem still persists. For the hell of it I then updated the BIOS firmware but that made no difference either. All keyboard function work fine so I have been having to resort to using the arrow keys and alt tab and such to navigate around. I ran a Passmark Burn in Test and everything passed.
A couple of additional points. I ran the Hirens Boot CD which is similar to the Ultimate Boot CD. I then booted into the Mini Windows XP and the same erratic mouse behavior occured so this is clearly not an operating system issue. Also when I wiped and reloaded Windows I used the HP Recovery partition and ran their recovery operation. Their recovery GUI also has mouse capability and I experienced the same erratic mouse behavior there.
Not sure where to go from here. Seems to be some sort of motherboard issue. Wanted some other opinions in case I am missing something.
Thanks in advance,