If you get your IP blocked somewhere and you don’t like it, then this can be pretty useful.
One way is to just turn off your router for some time, but most people don’t have static IP routers and this won’t help.
If that didn’t help, then you have to renew your IP using windows’ command prompt.
1. Type cmd into the run box from the start menu.
2. Type ipconfig into the command prompt. This will show you basic info about your IP address.
3. Type ipconfig /release. This will remove your current IP.
4. …

Autoplay is very useful, but can also be a security risk.
To turn it on or off:
1. Open gpedit.msc from the run box from the start menu.
2. Navigate to Computer Configuration > Administrative Templates > System
3. Find Turn off autoplay
More Cool Windows XP tips & tricks HERE