i couldnt find a free version of adwareaway or any about blank removal but i found this:: and it worked for me.
To remove about:blank open your browser then go to view source.
Look for a string that looks like: res:%43%3a%5c (etc). Make a copy of the complete string then go to
Paste the string in here and press "clean data" you should get some ***.dll file. Write it down
then shut down your computer and restart it but DO NOT go online yet.
Go into "Find files or folders" type in the ***.dll when it appears move it to your desktop then delete it (or rename it if u cant delete)
and finally scan your computer with any malware scanner such as adaware
to delete any remaining parts of the program.
Now all you need to do is right click on your browser go into properties delete about:blank and type in what ever your homepage address was and click apply.