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I just built my third PC (Athlon 1800, 256mb DDR, 64mb Eagle nVidia GC, 32mb SoundBlaster Live 5.1 SC) and after installing Win XP I've had all sorts of problems from crashing to rebooting for no reason etc. and all of a sudden it won't boot up. As soon as it gets close to finishing the boot it restarts again, and again, and again. When I start in safe mode it displays the drivers it's loading and when it reaches mup.sys it restarts.
Does anyone know what mup.sys is?
John
I don't know what mup.sys is, but I have it on my XP system. My suggestion is to forget about XP and go back to Win98. I installed XP and have had all kinds of weird problems. I have a dual system and rarely use XP anymore
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Hint: "Multiple UNC Provider. Search out "mup.sys" on search engines, and discover that in some situations, it may well lead to the re-boot condition.
Posting to the XP forum might be more helpful.
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Another question is did you check compatibility of hardware, and software prior to this XP upgrade. I have yet to upgrade because two of my components do not have drivers that are XP compatible. There are a couple of sites to check on this and I can send if you are interested.
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I'm having the same problem now! Starting up my pc, but all I get is a grey (not black) screen.. When I start it in safe mode, it wont get any longer after loading the Mup.sys driver. Tried using my xp'cd to use the repair mode, but it stops when it says "starting windows"... Any suggestions???'
Please need urgent help
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The answer is here
insert your windows xp cd
let it boot up off the cd as if you are going to reload
when windows xp asks you if you want to install a fresh copy or repair, press R for repair
press 1 then enter
it will ask you for your administrator password put in if you have put one or leave it blank and then press enter
it will bring you to the c:\windows command prompt
type
cd system and press enter
then type
cd config
you should then be at
cd:\windows\system\config
then type
ren system system.old
then type
ren software sofware.old
then type
ren security security.old
then type
copy c:\windows\repair\system "enter"
copy c:\windows\repair\software "enter"
copy c:\windows\repair\security "enter"
for all of them it should of had said one file copied everytime you entered.
after all of this type exit remove the xp cd and boot into windows.
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I have the same problem with my computer stalling on Mup.sys during boot-up. I have tried to follow the solution in response number 6, but my 'config' directory is a subdirectory of the 'windows' directory rather than under 'system'. My options are 'C:\windows\config' or ''C:\windows\system'. What do you suggest?
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Sorry I had the directories wrong in my previous follow up, please follow these steps
1. Start your computer with the Windows XP CD-ROM.
2. In the Welcome to Setup screen, press R to repair.
3. If you have multiple versions of Windows running on your computer, select the installation you would like to log on to by typing the number of the installation and then pressing ENTER.
4. Type the Administrator password for your computer, and then press ENTER.
5. At the prompt type "cd system32\config" (without the quotation marks) and then press ENTER.
6. Type "ren system system.old" (without the quotation marks), and then press ENTER.
7. Type "ren software software.old" (without the quotation marks), and then press ENTER.
8. Type "ren security security.old" (without the quotation marks), and then press ENTER.
9. Type "copy drive:\windows\repair\system drive:\windows\system32\config" (without the quotation marks), and then press ENTER.
NOTE: Where drive refers to the drive letter where Windows XP is installed.
10. Type "copy drive:\windows\repair\software drive:\windows\system32\config" (without the quotation marks), and then press ENTER.
11. Type "copy drive:\windows\repair\security drive:\windows\system32\config" (without the quotation marks), and then press ENTER.
12. Type "exit" (without the quotation marks), and the computer restarts automatically. Allow the computer to boot normally.
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I recently started having the same prob on my home PC running WinXP Pro. Safe mode stops at mup.sys, attempting to boot normally gets as far as having the white bar go across the bottom of the screen then to a blank screen and no farther. I attempted the fix in response 8 however I cannot even boot completely to the cd. It gets as far as Starting Windows and no farther. I have tried different hdd, removed all other components and still nothing. I've cleared CMOS. The only thing I have not swapped out is the mobo and proc. I did bring the system down to my shop last night and got it to boot once but it then locked up after getting into windows. Upon reboot I get the same problem with the blank screen.
Can anyone Help?
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If you press F8 continually as Windows is starting it takes you into the recovery console. I restored my system settings to a couple of days previously after entering safe mode. This seems to have worked.
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I had that problem at one point, on a machine that had Windows 98 and was upgraded to XP. I got frustrated to the point where I installed a fresh copy of XP and the problem was resolved.
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I had a similar problem after installing XP. Would hang at Mup.sys for 50 secs before continuing the bootup. Solved by setting BIOS to APIC function (not PIC). Now boots within 30 secs. see following URL for detail. http://www.rojakpot.com/Speed_Demonz/New_BIOS_Guide/APIC_Function.htm
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Forgot to mention that you need to reinstall XP after BIOS change to APIC I/O. Device manager should display Computer as Uni-processor with ACPI (if single processor). See URL for more info http://www.microsoft.com/hwdev/platform/proc/IO-APIC.asp
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This error is mostly related to the APIC setting in your computer BIOS. Once your windows 2K/XP has been installed on your computer, you can no longer change this setting !! This error often appears after you perform a bios upgrade (when BIOS defaults are loaded) or after changing the default BIOS settings. Always check the APIC settings before altering anything in the bios. Changing the APIC to the same settings as when installing the windows solves the problem !!
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