After buying a new domain and for sure you have to  change to new DNS in your domain point to your hosting. My experience on changing my DNS, usually it will take 48 hours.

Most DNS clients cache the results of name resolution requests. This speeds up name resolution if multiple look ups are done to the same address, such as is common when browsing the web.

Sometimes a bad DNS entry will be cached and you will need to either flush the DNS cache to get rid of it, or wait up to 24 hours for it to be dropped from the cache automatically.

How to Flush DNS in Microsoft Windows

In Microsoft Windows, you can use the command ipconfig /flushdns to flush the DNS resolver cache:

type cmd in box for Vista or for XP type in run box

C:\>ipconfig /flushdns

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.

You can also use the command ipconfig /displaydns to view the DNS resolver cache.

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