about:blank is a perfectly valid address. Browsers don't "come with it"
There may be a problem with Chrome or you may have a malware infection.
WHen you did a Google search for "chrome about:blank" (You DID try to help yourself first, didn't you?), you may have missed these first two results:
http://www.google.co.uk/support/forum/p/Chrome/thread?tid=1932fa9e5dec3526&hl=en
http://www.google.com/support/forum/p/Chrome/thread?tid=19f10c9e09d65624&hl=en
If you think you have a malware problem (Trojan, etc.,) you should find a lot of help at www.whatthetech.com
Trevor
March 2010