The default page for any version of IE is MSN, not Google so something else has caused that. If you want to change it, simply go start > control panel > internet options > general > homepage and then type in the address of what you want.
If its Google, then use h ttp://www.google.com
At the moment its probably set to
http://www.google.com/ig-randomcharacterstring
And no - it wont affect other browsers