I had this problem for the past 1 week. I just couldn’t login to my admin panel at all.
All it did was load blank white page.
Fortunately, for me my friend Rishabh Sood helped clear the malicious coding in my WordPress files and completely restored back NPXP to the way it was.
Here is NPXP all loaded up and on WordPress 3.0
Thanks to Rishabh 
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Hey, this is Kamal and I operate the NPXP network of websites. I am a blogger as well as a freelancer.
Hi Anthony here from wordpressmonster.org, the blank page in admin either when you add something or it just happens is normally related to the memory space being full you can increase memory space with a simple htaccess file added to the root directory of your wordpress blog. I have added a download of a htaccess file to wordpressmonster.org for anyone to use this should cure your wordpress blank page problem just unzip the file then upload the htaccess file to the root of your blog anyone who is not confident in doing the please contact me for help.
Click
to Download
Best Regards
Anthony (Admin)
Wordpressmonster.org