After very long time our site got the page rank 4. Our site also got links around about 50 and all pages of the site had been crawled by the google in the last month.....BUT...still our site is not within 700 result for our related key words search.
Can any body suggest appropriate soltuions for this serios problems?

You need more inbound links... you are indexed.

http://www.google.com/search?sourcei...atvasoft%2Ecom

I'd also suggest unqiue page titles

Check out this article on Improving Link Popularity

Avoid links at Guestbooks.
If you want the results, you need to be at relevant places.

Get into some best directories around.

try http://www.directoryarchives.com

Many sites have lots of guestbook's link rather than related links and still they are within top 10 result.
What is the reason behind that?
There are other site which have 4+ rank and also related to our site, linking with us shown in the yahoo but not in Google....MSN....
Why?