BleepingComputer.com: Certificate Services Client

I've been trying for a long time to quiet my HD. I have HP Media Center PC with AMD dual core w/2 GB ram and Vista Home Premium 32 bit OS.

I've been fairly successful in getting rid of HD run on. But the latest culprit seems to be Certificate Services Client. From what I can read on the web it seems to have something to do with Corporate Domains and users credentials when using other than their usual PC on the network. I have a 2 PC home Lan and am not on a domain. So I don't understand why I need this or why it's even running. I don't use Windows file encryption afaik.

So my question is, can I safely disable the Certificate Services Client scheduled tasks in Task Scheduler?
Seems like once they kick off I can forget about burning a DVD for 10 or 20 minutes.