Castlevania virus

Weird problem here, and I haven't been able to find any information about this, so I'd thought I'd ask. My PSP is writing saves for some PSX eboots with SOTN thumbnails:

http://img368.imageshack.us/img368/5369/wut1tt5.png

http://img205.imageshack.us/img205/5861/wut2ca8.png

http://img205.imageshack.us/img205/1941/wut3ur0.png

The weird thing is, SOTN isn't on any of my cards and hasn't been for a long time, neither are its saves, neither is the thumbnail. Formatting cards does nothing. It's really starting to annoy me. Is it held in the flash somewhere? Should I try to get rid of it? Any help or advice will be very much appreciated. Thanks in advance.