How do I repair my PC to avoid to appears messages saying: "This is not a valid Win 32 application"

Dear Sir:
My problem is:
A message that appears when I try to install an antivirus in my PC, saying:"This is not a valid Win 32 application" (See the attached I send with the present)
Please, I hope someone help me to solve my problem.
Waiting a reply a thanks in advance.
Symotom
Tuesday, 23 March 2010

win32-box.jpg
SYMOTOMAsked:
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nicsaintCommented:
The file is probably corroutped so try downloading and reinstalling the avast! Antivirus software from http://www.avast.com/free-antivirus-download 
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nicsaintCommented:
Of course if you were installing the AntiVirus program to get rid of a suspected virus, then it is likely that the problem is caused by the virus which will need to be disabled first.
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SYMOTOMAuthor Commented:
Dear nicsaint::
Thank a million for your above assistance.
Now my problem is:
When I try to run the http://www.avast.com/free-antivirus-download, It  is blocked and it does  not open.
You say too  "the virus which will need to be disabled first", but lamentably I do not know how to do it.
Please, if possible, tell me how can  I  disable the virus  first.
Waiting yor reply I thanks in advance
Symotom
Thuesday, 23  March  2010
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SYMOTOMAuthor Commented:
Dear nicsaint:
Please, don't forget me, because I am weiting your excelent assistance.
Best regards
Symotom
Tuesday, 23  March  2010
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nicsaintCommented:
Restart the computer in Safe mode and when logged in click the Start then Run
Type MSCONFIG and click OK
Click the Startup tab and click Disable All and then click OK
Restart the computer and again and run the avast! setup program. (If possible use an avast! setup program downloaded using another uninfected computer).
If successful then restart the computer and run the antivirus scan.
Once the scan has completed again click the Start Button type MSCONFIG and renable the applications under the Startup tab.
Restart the computer.

If you were unable to install the antivirus program using the above method. Try running it whilst in Safe Mode
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nicsaintCommented:
Please provide feedback as to whether the problem has has resolved
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DooDahCommented:

WebrootSpySweeperW/Antivirus very preventative based on SOPHOS, works with Symantec.

What I like about WebrootSpySweeperW/Antivirus is that it cleans Viruses/Malware and flags websites (intercepts the website's attempt to re-infect) in REAL-TIME.    Find it at; http://www.advmolink.com

WebrootSpySweeperW/Antivirus is the cheapest way to get the SOPHOS Antivirus Engine protection on your computer updated several times a day. ( http://www.advmolink.com )

There is current a $10.00 OFF coupon for WebrootSpySweeperW/Antivirus on the SIDE SCROLL at   http://www.advmolink.com


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SYMOTOMAuthor Commented:
For the moment I solved the problem with your last advise, so,  please,  I ask you to close this question.
Regards
Symotom
Saturday, 24 April 2010
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SYMOTOMAuthor Commented:
Dear Sir:
My problem is that I do not know how to delete this abandoned question.
Please, tell me how I do it
Regards
Symotom
Thuesday, 04 May  2010
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