Is It Possible To Retrieve Deleted Files In A Pc With Xp Operating System ?

I gather you mean other than the Recycle Bin.

There are a number of data retrieval utilities available on the web, some free, some not, some better than others.

The most important factor in data retrieval is to not use the drive you wish to retrieve the data from. (Using the drive writes to it (ie; pagefile as an example) and the data you seek may be further over-written.) It should be slaved into another working system (with a retrieval utility loaded/installed) and any of the data you capture should be placed elsewhere. (Another partition/another hard disk.)

Here's a Google search for free utilities:
http://www.google.ca/search?hl=en&q=data+recovery+free

Further to the comments made by Dan, have a look at the following: -

http://www.recuva.com/

Good luck.

Just a note: Be careful of BETA products. BETA means "still in the testing phase", generally speaking.

Good point, Dan.

Here are a few more options for you, vps_2002in. Some are free, some are not: -

http://www.majorgeeks.com/downloads38.html