Set automatically mediaportal (and necessary A/V remote Apps) on realtime priority we (1 Viewer)

[fanoI]

MediaPortal Version: 1.10
MediaPortal Skin: Revision
Windows Version: Windows XP SP3
CPU Type: Intel Core I3
HDD: Seagate 500 GB
Memory: DDR3 4 GB
Motherboard: Asrock
Video Card: Intel I3 embeded GPU
Video Card Driver:
Sound Card: Realtek iIntel's embedd audio card
Sound Card AC3: SPDIF optical
Sound Card Driver:
1. TV Card:
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: Purevideo
MPEG2 Audio Codec: Purevideo
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case: CoolerMaster CM-250
Cooling:
Power Supply: AsRock Core100
Remote: ASRockremote (emulated via Logitech Harmony remote)
TV: Sony KDL-46W4500
TV - HTPC Connection: HDMI

My Media Center computer is used as a real computer (Firefox, A/V compression, DVD burning...), sometimes I'm playing a video and, using one or more of the other cores doing something else... in the same time I play a movie and Mediaportal when other cores reach 100% usage freeze for a second and then restarts...

It will be beautiful when I press the play button in my remote it happens this:

1. Mediaportal goes in Realtime Priority
2. EventGhost too, so remote works
3. ffdshhow and , eventually Haaly Mediasplitter, too
4. Reclock goes in Realtime Priority

... the browser wants to stop the OS (and Mediaportal, too) and it's locked

When Stop it's pressed all should return as normal...

There's a plugin or external application to do this? Eventghost can help me to do this?
It has sense ?