Mac and Windows dual boot problem I have a software problem with my Mac laptop:
I had made a division in the hard drive some time ago and installed Windows in the other partition using Bootcamp software.
But now I think that the Windows partition is getting full and when I try to switch from Mac to Windows, I get a message saying "inadequate system resources"
and the Windows side does not boot up. Can you tell me what to do to fix this issue? 

Thank you very much; I'm stuck and have some important documents on my laptop.
This is most likely to do with the temporary 'swap' files that Windows uses and needs to run. It would be nice to be able to downsize your OS X partition and upsize your Windows partition, but sadly NTFS is not that convenient. 

Clear out any unnecessary files from the Windows partition from the Mac side, accessing it through Finder as falconbridge said. Then try and boot into Windows again.