Hi, 2 weeks I'm looking for an issue... And just now, I understood all my problem came from that file. I ran DirectX just after shutdown Rscmpt.exe and DirectX detected only 32Mo for my Creative Blaster 4 MX 440 (GeForce 4 MX 440). But, using the little program BoonieRat posted, it appeared it detected 64Mo of Ram. A little description of my PC: Windows XP Home CPU: AMD Athlon XP 2000+ RAM: 512 DDRAM Motherboard: Gigabyte GA-7DXE (AGP 4x) Graphical: Creative Blaster 4 MX 440 (Geforce 4 MX 440 Chipset - Latest Nvidia Detonator Driver) Sound: Creative Soundblaster 1024 LIVE! (Latest Creative Driver) Testing with DirectX : The cube test turn very laggy Rscmpt : existing and uses more than 80% CPU (64Mo Video - 32 after shutdown) I've got another PC: Windows XP Pro CPU: Intel Pentium II 350 MHz RAM: 512 SDRAM Motherboard: Legend QDI 440 BX Graphical: Creative Blaster 4 MX 420 (Geforce 4 MX 420 Chipset - latest NVidia Detonator Driver) Sound: Creative Soundblaster PCI 128 (latest creative drivers) Testing with DirectX : The cube test turn perfectly Rscmpt : none and DirectX detect 64Mo My 2 PC are using the SAME Detonator Nvidia Drivers!!!! If you understand, just tell me Information about regedit: rscmpt in my first PC with the problem: HKLM/SOFTWARE/MICROSOFT/Windows/CurrentVersion/Run I just deleted it and reboot, just to know... nothing in Registry in the second. So this is not necessary to use it!!!!