Music Trivia plugin - cannot remove (1 Viewer)

[thebalance]

TV-Server Version: as supplied with 1.0.2
MediaPortal Version: 1.0.2
MediaPortal Skin: Blue 3
Windows Version: XP Pro SP3
CPU Type: AMD 4850e, 2ghz Core 2 duo
HDD: 1Tb Western Digital greenpower
Memory: 2*2Gb DDR2 667Mhz
Motherboard: Gigabyte MA78GPM-D2SH
Video Card: Radeon HD3200 built in
Video Card Driver: Ati Catalyst 9.4
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppage WinTV-HVR3000
1. TV Card Type: DVB-S (in use) DVB-T & analog not in use
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:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider: Freesat
HTPC Case: Silverstone
Cooling: Passive silverstone on CPU, single case fan
Power Supply: Antec Earthwatts
Remote: imon pad
TV:
TV - HTPC Connection:

When I try to uninstall the music trivia package I get the message "invalid package" - can anyone tell me how I can remove somehow please.