Browser hijacked: "search for..." page hijacked my web browser. HELP!!!

My homepage keeps changing to "about:blank" after every
time I open new browser and some unknown "search for..."
page hijacked my web browser. Every tine I ran AD-AWARE
program, I come across "Possible Browser Hijack
attempt/RegData/Data
Miner/HKEY_CURRENT_USER:Software\Microsoft\Internet
Explorer\Main "Star Page" ("about:blank")".Every time I
restart my PC and open new browser, "about:blank"
and "search for..." reappear after numerous attempts to
delete with AD-AWARE and over Spy-Ware programmes. Please,
help reset my web browser to previous homepage setting.
Every time I change homepage it switches back to "search
for..." page and default homepages setting switches
to "search for..." web browser.