There are more ways to try and recover files than mentioned below, but the learning curve for using those is kinda steep, there's a disksize times two space requirement on a physically separate drive and then still there's no guarantee as to what can be recovered due to all sorts of factors. Best try these ones first. If you need to mount the drive the deleted files are on you will have to mount them as read-only. Never write to it and never try to repair problems either.
Your other (closed) thread differs from this one saying: i deleted some VERY important documents from my windows partition
. So, if it's NTFS the files where on then check www.linux-ntfs.org
for the "NTFS Tools and Library" package which contains "ntfsundelete". Make sure your read and understand the documentation. If it's FATn the files where on search LQ for "foremost". If it's journalling ext3 the files where on then chances are very slim.