Unhide was create to restore the mofifications made by some malwares (crapwares, rogues, fake anti-spywares).
This softwares are like real anti-malwares but they are fakes. This malware hide your documents and make some modifications in your registry to make you believe that you have lost data on your hard drive. He then asks you to buy the program to restore the data it has hidden itself.
Your data , however, are completely intact, you just can't see them. He was developed to make your data visible and restore your missing Start menu shortcuts , and your Windows desktop. During execution are , Unhide also restore certain Windows Registry settings to their Windows defaults .