Hello, I recently build a new system. Specs: CPU: Intel Core i7 860 Motherboard: MSI P55-GD65 Ram Speed, size and #sticks: GeIL GV34GB1333C7DC 2x 2GB DDR3 GPU: Club3D HD 5850 1GB (CGAX-58524IDP) PSU : Cooler Master Real Power M620 OS: Windows 7 HDs: Intel Postville SSDSA2MH080G2C1 80GB, Samsung Spinpoint F3 HD103SJ, 1TB However, I have been experiencing BSODs with different descriptions, but PFN_LIST_CORRUPT appears to be the most common one. This seems to be related to memory, so I ran a memory test, which didnt detect any errors. The crashes happen mostly during games, but it also happened while installing a media player plugin for firefox, and - I think - twice within 5 mins after a cold start. I'm kind of stuck now. I know how to handle PCs quite well, but this is a bit over my head. Can anybody help me? Attached are my 8 most recent minidumps.