hi im new in this forum so please forgive me if my post is not good enough im troubleshooting this assus loptop with windows XP installed since it keep rebooting when blue screen appears in boot process i thought there are some virus/spyware installed on my OS so i boot on safemode to run some spyware and antivirus but still in safemode the blue screen appears and reboot i can't boot to safemode,this one time i can use safemode but after a few minutes browsing or using some program the blue screen problem again,i thought that the OS have some problem so i installed fresh copy of windows XP but during the copying the files,some .dll and .sys file wont copy from XP cd i almost used 3 types of XP installer the same problem, i used esc to those file that cannot copy during installation and finish copying but in the windows xp menu for finalizing the installation some error display and the blue screen appears again i copy it and here it one of it A problem has been detected and windows has been shut down to prevent damage to your computer PFN_LIST_CORRUPT if this is the first time you've seen this error screen,restart your computer. if this screen appears again,follow these steps: Check to make sure any new hardware or software is properly installed, if this is a new installation, ask your hardware and software manufacturer for any windows update you might need. if problems continue,disable or remove any newly installed hardware or software.disable BIOS memory options such as caching or shadowing. if you need to use safemode to remove or disable components, restart your computer, press f8 to select advance startup options, and then select safe mode TEchnical information: ***STOP: 0x0000004E (0x00000099,0x00000000,0x00000000,0x00000000) Beginning dump of physical memory physical memory dump complete contact your system administrator or technical support group for further assistance. and restart, the red txt corrupt file change in other blue screen, is these problem my hardware since this loptop using only powersupply no attach battery is this maybe one of the cause. hope you can help me.