Errors on Windows and Internet Explorer?

I tried to download Yahoo Messenger. But an error occured toward the end of the download, while it was dling the extras... When i rebooted I now get an error in Windows Explorer when I used the start menu and I can't maximize or use the tab key in IE or it will give me an error there. I have already done an adaware scan. what else can I do? Besides reinstall windows because I don't have a reboot disc?

Errors on Windows and Internet Explorer?microsoft publisher

http://www.microsoft.com/athome/security...

http://www.microsoft.com/athome/security...

Windows Live Safety Center is a new service that lets you scan your computer to help protect, clean, and keep it running at its best. The service is free and available directly from the Internet at http://safety.live.com. You can revisit the Windows Live Safety Center for subsequent tune ups as often as you like.

Errors on Windows and Internet Explorer?microsoft live internet explorer

What Error Message is coming while using Tab key or maximising the window,,,plz give detials,,,otherwise DONT BE SHY,,reinstall ur Windows with latest version,

Thanx
don't need to reinstall windows if this works:

restore your system to a privious time for example before installing yahoo messenger.

go to:start -programs-accessories-system tools-system restore

then select restore .and then select the days in bold.for example yesterday before installing messenger.
I had the same problem .

The messenger has some files missing , start the install again and it will finish downloading .
Could be anything...

Please post the exact wording or link to a screenshot of the error messagees, and which version of Windows you have.

Try a Windows update

http://windowsupdate.microsoft.com