16 bit MS-DOS Subsystem pop-up

Well today I was putting in Windows 7 Home Premium in my 2nd hard drive. Been setting things up, adobe flash player, install firefox, etc. but when I left my room and I come back, I got this weird cmd.exe in my background but showed up with a pop up saying this...

Title bar: 16 bit MS-DOS Subsystem

"C:\Windows\system32\cmd.exe
The NTVDM CPU has encountered an illegal instruction.
CS:0de8 IP:011d OP:65 2e 63 6f 6d Choose 'Close' to terminate the application."

So I click Close. Nothing seems to happen... but what I remember, I was using the Yahoo! CA Anti-Spy program and allowed the hijacker but I thought it was a false positive... it something like start.jk.swa or something I can't remember at all. So there it went, then I got that message above in the quotation. Well I went back to the program, and look in the allowed windows, and remove it. Then I try to rescan it again, it never come back up. :/ Oh well, hope nothing happens.

My cousin helped me to search... I type in the whole thing in google, nothing shows up but he found this...

HTML Code:

http://forums.techguy.org/windows-xp/465214-solved-ntvdm-cpu-error.html

...and its saying like I might have malware instructed. it also said something about win. xp, and nope I don't have win xp anywhere. No program are set as xp compatibility. So, any idea anyone?

Btw, it popped back up again, so idk if it would be continuous.

So my cousin told me that I can't run 16-bit program on win. 7. That... make me think of PhotoShop3, they use a 16-bit mode. I remember using it in the Win. 7 R.C. Beta mode, no problem, even tho the 16-bit does shows up in the task manager.

-Edited-
I restarted my computer, I don't see it come back up again. Might be some application or program that got hung up. But if i seen it pop up again, I will let you all know.

So I click Close. Nothing seems to happen... but what I remember, I was using the Yahoo! CA Anti-Spy program and allowed the hijacker but I thought it was a false positive... it something like start.jk.swa or something I can't remember at all.

You allowed a highjacker? could the extention of this something jk.swa been a javascript .swf?

Run a scan with MalwareBytes' Anti-Malware
download Malwarebytes' Anti-Malware to your desktop
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* Double-click mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select Perform full scan, then click Scan.
* When the scan is complete, click OK, then Show Results to view the results.
* Be sure that everything is checked, and click Remove Selected.

Okay ... well clean your Java cache too ... This application will safely clean it. It works with Windows 7 even tho' it doesn't say it does.
ATF Cleaner ATF-Cleaner.exe - www.atribune.org