If this is in the wrong subforum, please feel free to move it I'm posting here because I have no idea what's going on with my friend's computer. I built it for him and it ran flawlessly until he called me a few days later saying that it was constantly BSOD'ing. I went over and I managed to write down the error code (BAD_POOL_CALLER). I've ran Orthos for a few hours without any problems (nothing is overclocked here), and I even went as far as to reformat for him. I'm about to run Memtest, but I was wondering if there was anything else I could do or check for him? And just extra info but the BSODs occur at any time... it can BSOD on the desktop, while he's trying to play CS:S, or just when he's browsing the web. Any ideas/suggestions are welcome... thanks in advance! Specs are as follows: AMD Athlon X2 5000+ BE (stock speeds) Gigabyte GA- M57SLI-S4 Skt. AM2 A-DATA DDR2 800 2x1gb (stock) MSI 8500GT Western Digital 160gb SATA Idle temps 23-24C, load temps 43C with an AC Freezer 64. If I'm missing anything important let me know. Again, it has passed Orthos for at least 4 hours, and I've yet to run Memtest on this.