For your specific problems assadof1, I've no idea. About your PC's, it does sound like overheating. Is there a blue screen of death (BSOD) or any restarting, or does it literally just freeze? If it's just freezing then I'd guess it was the graphics card overheating, as if it was the CPU, it would normally BSOD or automatically restart. Does your graphics card have a fan? Is it working? With the info I have it sounds like you need a better graphics card cooler as the default isn't adequate (guessing it's got pretty hot there recently?). Give me your graphics card model and I'll check out what should work for it - whether you could get it where you live is another matter.
Time servers:
Most get those time server errors. I've no idea why - perhaps the default server has gone down for a while. Just turn it off*, but it's got nothing to do with any crashes.
* Double-click the clock in the bottom right (or where ever you have it) > hit the
Internet Time tab > untick
Automatically synchronize with an Internet time serverIf you do want automatic synchronising, I'm sure there's plenty of other servers out there - even some routers provide this functionality. There's a list here for specific regions (just copy and paste one of names you use into the
Server box):
NTP servers. Obviously I use the UK one (
Europe >
uk.pool.ntp.org). That will let the host decide which UK server to use. You can use a specific server if you choose, in which case you might use
Europe >
United Kingdom >
1.europe.pool.ntp.org - there normally won't be a need for this though