PowerDVD should not need to run, at startup.
You should be able to disable running at startup, from the programs Options menu.
Can't be positive about Media Center Receiver Service
, but from what I'm seeing, you should be able to set it to Manual
, without any adverse effects.
Manual allows Windows XP to start the service when it needs to, but not at boot up.
Depending on your configuration, not all services will start when required while in Manual mode.
If you find you need this service, set it back to Automatic
There are no other services dependent, on this service, and as you stated, it's for TV and FM broadcast reception.
If you don't need these features, there's no need to have it running at bootup.
To set it to Manual:
/ type in; services.msc
This will open the Services
Scroll down to Media Center Receiver Service
Double click it.
In the box that opens, click the General
Next to Startup type:
, click the dropdown arrow, and select Manual
Reboot your computer.
Check this thread for some XP tweaks:Windows XP Tweak Guide
You might also want to check out this guide, to tweak your running services:Black Viper's Windows Service Pack 2 Service Configurations