Please help me immediately

well first of keep your C drive clean... keep only program files and windows files there, keep all your songs and videos into some other drive, don't keep music and videos in your 'my documents', 'my songs' and all... well the cut pasting thing won't help now... hmmm try to get the set up file of that software and reinstall at C drive or you might also install it some other drive so that when you are formatting your C drive you don't have to reinstall that software... hmm well what part of the software file did he cut also matters you know, coz if he has taken the main folder of the software from the program files then he might have a chance to get it back to place, he might not be able to cut paste things into the program files folder as he might not have logged on as a administrator, if you get the administrative rights then you can do paste things in your program files folder... just take care friend, log on as an administrator and copy the software folder contents properly(if it contains all the necessary files of the program).... and the program should work fine then....

I would recommend getting a larger hard drive and adding it to the machine. You could purchase an external hard driver or buy an internal hard drive and an enclosure. Hard drivers are now very inexpensive and a great solution when you need more space. I have done this a few times myself and it always helps me out.

when you say a software file do you mean a saved document or the actuall software? If it's a document your friend created it could've become currupted when they tried to cut and paste it to another drive because the computer didn't have enough memory to copy the file. Recovery software (used properly) could be able to get the file back if so. but if it's the actuall software program then most software/programs only work if they've been installed - they usually have/need more than just the main .exe file to work, and won't work if all the program files haven't been installed to the right/same location. (basically when the program's run/opened it tries to find the other files/bits of the software it needs and if it can't find them - because it's in drive D and the other files are still on drive c, it won't be able to run properly) Most software can't just be moved/c&p'd from one drive to another but needs to be propaly uninstalled then reinstalled to the new location. (I've learnt this from bitter experience)

Hey, I don't really know how to answer your question, sorry about this. Hopefully someone else will be able to answer your question better than I have done, in a really good way so you can understand and benefit from it. Make sure you have a good day, Happy Lotting!!

Try re installing the software. Cut pasting from one drive to another works in most cases lest registry isn't involved. Why can't he remove some files from C if the software is so important?!

the best solution for this is to uninstall the existing software from the computer and then reinstall that software again. If you dont have the setup for the software then you can do a system Restore to a date or a restore point when the software was working perfectly. Before doing system restore just backup the files and folders that you modified after the restore point was created.