Follow andre's advise and post him your hijack log it
will reveal whatever's causing this,
i'm thinking this could be related to About
:Blank but you
would need to check the hijack logs to confirm this.
let andre check them over for you,if its connected to
about
:blank the R0 & R1 entries will have Search Bar =
res://C:\WINDOWS or something similar in the line.
If its this but im only guessing without seeing the
hijack log then you can download AboutBuster which is
meant for this res://C:\ variant
http://www.downloads.subratam.org/AboutBuster.zip
Hijack this is the first step though
Good Luck
Andy