Hello well here is my problem: A long time ago I encrypted a file, one really important for me, and about 3 weeks I formated my COMPUTER and reinstalled Windows XP. Now this encrypted file is refusing me its access like if it was not recognizing me as his owner. It thinks my ANCIENT computer (before I reinstalled Windows) is the only one that can access it. So if anyone can HELP me I would be really greatful, it is an important file for me.

PS: My hardware is in NTFS and the file is a .doc oneTry Here
However if you encrypted it properly nothing short of the correct password is going to help i'm afraid...It is not even asking me for a password, I did the things from the link you gave me and I still have this stupid access denied Which software did you use to encrypt the file? if you used an encryption program to encrypt it & formatted the HD, you'll need to reinstall the encryption program.You probably didn't do this on the original computer, but did you make any recovery agents for your encrypting file system? It doesn't recognize you as the owner because technically you aren't the owner. Every time you create an account a new SID is generated. Windows USES this SID as well as the SID of all designated recovery agents when Encrypting and decrypting data from Encrypted files.

Sadly, there is no way (that I know of) to recover the data in the file if you have neither the original SID of the CREATORS account or a designated recovery agents SID.

In Short, it isn't the old computer it is looking for, rather it is the old account information.