There are quite some things that could be possible.
Enumerating them all here.
1.You did delete them.
They should be in your recycle bin unless you emptied it. (do not worry ,it can be recovered even after that). If this is not the case then,
2. The folders where you had your data are hidden now.
You can view them by going to tools-> folder options-> view...
and check the box which says "show hidden files and folders"
If this is not the case then
3.The worst case scenario.
You have deleted them and even emptied the recycle bin.
Get a data recovery software. I recommend "Search and Recover" by iolo.Also tune up utilities 2010 is not bad either .www.tune-up.com/download/
Run it and it will recover even the lost data.
In most cases ,data files are recovered easily.
.if you liked it then please comment on it.