May 062008

You may experience the following error when installing Windows XP Service Pack 3 (SP3) when installing on Intel iMAC using Bootcamp to run Windows XP.

There is not enough disk space on C:\WINDOWS\$NtServicePackUninstall$ to install Service Pack 3 Setup requires an additional 4 megabytes of free space or if you also want to archive the files for uninstallation,Setup requires 4 additional megabytes of free space. Free additional space on your hard disk and then try again.

This happens because iMac uses EFI file format which Windows XP does not support. To workaround this problem, add a registry key as follows:

1. Click Start – Run – Type “regedit” and press enter.

2. Navigate to

3. In the right pane, Right-click and select New – String value

4. Name it as “BootDir” and set its value to “C:\”

This should help. Try installing SP3 and should work fine.

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  243 Responses to “Error “There is not enough disk space” when installing SP3”

  1. Thanks! Worked for me too on a Mac Mini!

  2. Thank you, I am also running XP with Boot Camp on a Mac Pro. This works a treat, I never had the problem installing XP on my Mac Book Pro though? Strange.

  3. Brilliant, many thanks for figuring this out and posting it. After a couple of years of getting annoyed with the update, this finally did the trick!

  4. Awesome! Worked on a non Mac laptop that had the hard drive formatted on a Mac.

    Wonder why Microsoft doesn’t have this down as a fix for the problem.

  5. Thanks! This did the trick for me. XP on Mac Book Pro.

  6. Yep I thank you too..Worked like a charm

  7. Did everything you said and it didnt work….. Went back and double checked and i didnt click the “setup” folder so i put the New String value in the wrong place haha Feel like such an idiot ! Changed it worked like a charm thank you ever so much !!!!

    Alex T

  8. nope, ive tried this fix several times on my new macbook without success. The same error message everytime! i’m closing to giving up on windows, and just sticking with mac

  9. Thanks! Worked for me too on a MacbookPro

  10. Hey, great advice! That worked like so awesome. Keep up the good work.

  11. Worked like a charm for SP2 on new iMac. Thank you!

  12. Worked on MacBook Air. Sweet! Thank you and thanks to Google!

  13. core2duo iMac. Cheers, mate. This solution should be on apples bootcamp support site.

  14. My kids have a Mac mini that they wanted to run Windows on for certain things. I am a great computer user but not much on the inside workings of one. Nevertheless, I installed Windows XP Professional Svc Pk 2 on it and it would not let me set up internet. My hubby, a computer security engineer, said I needed Svc Pk 3 for WPA2. I tried to install but got that stupid message. Hubby, who is always at work so can’t help much at home, said to Google the message. I found this site. I followed the instructions exactly as you wrote them, and it worked for me! Thanks so much for the solution. Now, if I can just get the internet to work, all will be well.

  15. It’s working! Even as I comment.
    I’ve found out in consulting to developer groups, there’s always ‘The Guy’, the one guy in the group that actually knows how everything works. You are ‘The Guy’ in this particular domain. Thanks.

  16. Brilliant vistafix! Thank you – worked like a charm

  17. Thank you very much! This worked great!

  18. I agree with the Comment by Marc on June 29, 2008 @ 8:04 am:

    Had this problem on my iMac.
    BEAUTIFUL solution, pure poetry.
    Thank you for sharing!

  19. Thank you, thank you, thank you, thank you, thank you ….

  20. this is an amazing guide. thank you thank you thank you, so much

  21. Thank You! This was incredibly helpful in getting past that error on a Macbook Pro. Brilliant solution.

  22. great and briliant

  23. great and briliant thank you man so much

  24. absolutely wonderful, thank you very much for sharing this with us. I would never have figured this out in a million years.

  25. Worked as it said on the tin. THANK YOU

  26. Thank you so much i read in other forum’s format your pc to fix this you saved my life as i was on a tight schedule to get this machine running the world could do with more people like you with such genius fixes.

  27. ps. works with service pack 2 not enough disk space error to. thanks again

  28. Huge thanks. Very late night last night fighting windows 7 on MBP needing previous install and SP2 but SP2/3 not installng and only firewire network connections so no Online Updates

  29. Perfect, worked exactly as specified. I suppose because you’re telling any setup to use c:\ drive specifically.

  30. Your “fix” worked perfectly. I had pretty well given up on ever installing SP3. Thank you.



  31. Brilliant Work on Mac mini mid 2007 2GB with WinXP SP3

  32. Nice! Thank you very much. I was frustrated as I could not install SP3 on my macbook air. This has solved it. Thank you again!

  33. Thank you soo much, that did the trick.
    You Rock!!!

  34. Ur awesome thanks a million

  35. Over 3 years later and this little trick is still solving problems. Brilliant!

  36. I have no words to say. Really its amazing… You are the man, buddy.. Thank you..

  37. / fantastic this fix worked for my mb pro and with service pack 2 fanstastic thanks a lot

  38. Thanks! That worked!

  39. it works man, thanks. this is really awesome!

  40. OH! You deserve a Nobel Peace Prize for that one! I was about ready to see if a hammer might help it accept SP3!

  41. Thank you a million times!!! Worked for sp2 :)

  42. This was the only solution that actually worked that I found online. Thanks!

  43. Sorry I am kinda slow; how do u set the value to C:/..I get lost here.

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