there are logs and some utils ... but I don't have much faith in them unless you really know what to look for.
a snapshot of your machine only makes sense if you know
start by having a tidy round
run
http://www.ccleaner.com/download
run chkdisk
do a full defrag
(probably won't do a bit of good - but it's worth a go)
look in the box - does it look like a dust bunny just exploded?
update all your drivers
one of the other's may have a better idea ... but it can be a nightmare
(rojash walks on water when it comes to tracking down impossible faults)
have a good think -
what EXACTLY is going on / happens
what are you doing when it goes
what did you do (install/uninstall prog, update drivers, use new usb mem, .... before it started
the list is endless - (I had a windows update that crashed a machine only if a particular mem stick was plugged in ...!
a website with some odd popup
but sometimes it's reasonably straight forward
you do A - machine crashes
if it's not ... backup ... crash and burn