My Internet Explorer won't open.

Hi, download either Firefox or Opera browser to a USB stick and then install it onto the problem Pc, we can then run some tests on your Pc.

http://www.mozilla.org/en-US/firefox/new/
http://www.opera.com/
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Once that is done - post the following log file.
Download Security Check by screen317 from.
http://screen317.spywareinfoforum.org/
Or
http://www.bleepingcomputer.com/download/securitycheck/

Save it to your Desktop.
Double click the install icon.
If using Vista - Win 7 - right click the install icon and select "Run as Administrator"
A command Prompt window will open.
Let it scan the Pc - press any key when asked.
It should now open in Notepad.
Copy and Paste the result of the scan in the reply box below.

The saved log will be called checkup.txt.