I know the feeling as my computer likes to mess up a lot lately when I am playing poker,
william hill is unplayable for me lately so I don't even bother playing there while I am playing on this computer.
My worst case was not my computer crashing when I turned a FH but my internet disconnects, and didn't connect till the hand was over and I ended up folding the winning hand, the profanity that flew out of my mouth that night was shocking
I will be also getting a new PC but will wait till my birthday as I just had to get a new phone as my old phone was annoying the hell out of me
Have fun with your new PC