This weekend I installed WinXP SP2 on a Celeron 1.7 ghz machine. Previously it worked perfectly, but now the system hangs without notice when installing Network Software (XP setup screen). Changed the RAM (DDR2100) memory and still the PC freezes @ that point. After that I changed the Video Card and WinXP installed perfectly, but now the PC freezes in WinXP itself (doing nothing, just mousing ). Specs : Celeron 1.7 256 MB DDR 2100 HDD 40 GB Nvidia TNT2 Must tell that I put in the original RAM again as extra memory. Any idea's ?