Winstall.exe is part of a program called SpySheriff which is a fake anti-spyware program that is designed to fool users into paying for a full version of the program in order to remove a supposed infection which the ‘free version’ put there in the first place. Here are the removal instructions for SpySherrif / Winstall.exe.
This infection displays a message that is designed to look like it is part of the inbuilt Windows XP Security Center. Up the top it has the Internet Explorer security warning bar which says “Warning: possible Spyware or Adware infection! Click here to scan your computer for Spyware and Adware…â€Â

Once in Safemode:
Session expired
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superantispyware does this with one click.
google it
one of My favorite anti-malware programs is from a company called malwarebytes.org mbam-setup works great in removing malware.
Great thought I had a copy of this program already but it must have been deleted. As your instrustions stated the WINSTALL.EXE was gone.
This ‘infection’ sounds VERY similar to another infection called Internet Security 2010. Very annoying, it is.
My friend managed to open an email from a UPS delivery email saying that a package was ‘held in transit’. She is not that computer savvy and didn’t realise what she was doing.
The virus pretty much tried to cripple Windows.
Before going to check out my friend’s laptop, I watched Bryce’s video podcast on how to remove a virus without using a virus scanner. Thanks to him it had all the information required to stop the virus in its tracks.
I didn’t even use the Malwarebytes’ Anti-Malware software as I didn’t know if it could be trusted either.
The first thing I did was check msconfig and deleted the reference in the Startup tab. Then went to System Restore and restored the laptop to about 5 days previous. It rebooted and the warnings signs all stopped! I went back into her Outlook Express and deleted the email that introduced the virus in the first place.
I then checked Windows/system32 for any new files that had been created that day and deleted them too.
I then gained access to the net and deleted all the file associations mentioned on this page (down the bottom)..http://remove-malware.net/how-to-remove-internet-security-2010-rogue-anti-spyware/
All is working fine now!
I would love any input/critisism from experts who have any opinions on the process I went through to stop this virus.
Cheers.