A friend of mine has a PC running Office 2007 and has emptied the deleted folder. 
Unfortunately some of those emails are required for work and was wondering if it was possible to retrieve those deleted emails?

After googling this it appears that the emails themselves aren't deleted, only the entry in the index within the PST file.  Does this mean that it is possible to recreate the index entry and recover the emails?  If so, what is the easiest way to get these emails back? 

The PC has only been turned on once (for a short period of time) since this happened so hopefully this also helps.  

I've seen a few programs that claim to be able to recover these deleted emails but based on their websites I wouldn't trust them enough to install on a PC.

Thanks in advance.