That is no doubt your problem. Scince you can't download anything, you'll have to rely on online scanneers for the moment. use this for spyware
http://www.webroot.com/land/freescan...1&wt.mc_id=810
and try this
http://www.spywareguide.com/onlinescan.php
and this
http://www.ewido.net/en/onlinescan/
this for viruses
http://www.trendmicro.com/hc_intro/default.asp
then try pandasoft again.
after these, if they even work, go to Start/Run/ and type
sfc /scannow
and hit OK. the space after sfc needs to be there. This will scan for file errors. it will take a while. Then go to mycomputer/ and right click on the C drive, hit properties, and go to defragment. analyze and defrag your computer. This will also take a while. Then, in the same properties box, click the check for errors button. It mat tell you you can't do this until you restart, so do it. This will also take a while after you restart.
Then, after all of this, try to download the same thing I gave you a link for before. if that doesn't work, try to search for the download on your computer one more time, to see if it's just being stuck somewhere wierd, then let me know. I think these things may not work, but they are good for your computer anyway. If they don't indeed work, I have more ideas.