_default.exe (more info: shortcut to MS-DOC Program)
slrundll.exe (more info: Company: smart link)
twunk_16.exe
twunk_32.exe
my Installed windows is xp sp3
I can blocked ( _default.exe and slrundll.exe ) by Mamutu ?
well, please tell us more about those files, also upload them to www.virustotal.com and let it scan them and if it’s said it’s already analyzed you analyze again and post result here by link or screenshot of compact result, if you think you are infected please post a Hijackthis log file here.
The process SLRunDll belongs to the software Soft Modem or slrundll.exe by Smart Link (www.smlink.com).
Description: slrundll.exe is located in the folder C:\Windows. Known file sizes on Windows XP are 24,576 bytes (83% of all occurrence), 32,866 bytes, 36,864 bytes.
There is an icon for this program on the taskbar next to the clock. There is no file information. File slrundll.exe is a trustworthy file from Microsoft. Therefore the technical security rating is 17% dangerous, however also read the users reviews.
twunk_16.exe/twunk_32.exe is a process associated with Twain Thunker from Twain Working Group.
Part of the Thunking layer of COM - It allows 16 and 32 bit programs (such as old versions of office and modern applications) to interact.
You probably don’t need it any more but the system will complain if you remove it. Best to leave it alone.
thanks 
you’re welcome 