I am hoping I can get some suggestions as to what my problem might be. 
My computer is losing time, quite fast when powered up.
When I first boot up, the clock is correct, but will then speedily begin to lose time. In about 40 minutes it can lose as much as 15 minutes but this does vary a bit.
I run windows 8.1 64 bit. It has only been happening for around 4 days or so as far as I am aware.
I am leaning to my cmos battery being at the end of it's life but I can't see how that would affect the time keeping when the computer is powered on. I thought the battery was there to retain settings in memory whilst powered off??
I am a bit confused!
I intend to change the battery when I can get one just to rule it out,.
dog-man...

My computer is losing time, quite fast when powered up.
When I first boot up, the clock is correct, but will then speedily begin to lose time. In about 40 minutes it can lose as much as 15 minutes but this does vary a bit.
I run windows 8.1 64 bit. It has only been happening for around 4 days or so as far as I am aware.
I am leaning to my cmos battery being at the end of it's life but I can't see how that would affect the time keeping when the computer is powered on. I thought the battery was there to retain settings in memory whilst powered off??
I am a bit confused!

I intend to change the battery when I can get one just to rule it out,.
dog-man...