firsty

Since this morning 07-25-2008, whenever I try to send an email through my emil account (which works fine on my other laptop and my desktop) it causes an immediat reboot. My laptop uns on Windows XP Home, buidl 2003, I have avg free 8 installed so could it be this (have swithced this off however and still get same problem). Thought initially this was due to overheating fan or something first of all until I recreated the problem several times. The laptop will download m emails, delete etc but as soon as I click on 'New' and then type in a recipient Ikeep my fingers crossed. By the time I start entering a title for the email that when the reboot comes. Hae run an antivirus check and all it found was a bit of spyware -usual stuff, nothin strange Help please