delete the copy that you have on your desktop and download a fresh copy, I think McAfee must have interfered with the download and corrupted the program:
Now try running it again, please copy the exact error message that you get.
If it still fails - run the following:
Download OTL and save it to your desktop.
Double click on the [external image: Posted Image] icon to run it.
Make sure all other windows are closed and to let it run uninterrupted.
Check the boxes beside LOP Check and Purity Check.
Click the Run Scan button. Do not change any settings unless otherwise told to do so. The scan wont take long.
When the scan completes, it will open two notepad windows. OTL.Txt and Extras.Txt.
Note:These logs can be located in the OTL. folder on you C:\ drive if they fail to open automatically.
Please copy (Edit->Select All, Edit->Copy) the contents of these files, one at a time, and post it with your next reply. You may need two posts to fit them both in.