What antivirus/antimalware and firewall are you using?
Try using hijack this to remove it:
http://filehippo.com/download_hijackthis/Download and install the program. Then run it and scan your system.
look for the following entry:
O4 - HKLM\..\Policies\Explorer\Run: [winlogon] C:\heap41a\svchost.exe C:\heap41a\std.txt
delete this.....
after that open task manager and end a process called "svchost.exe".....there will be 4 or 5 processes with this name......try to end them one by one.....one or 2 of these is a genuine windows process others are one of the malwre's.....if you end the one belonging to windows then a message comes that the "system is shutting down because some vital process has terminated unexpectedly"......then just restart the system and end the right one from the task manager( also repeat the step with hijackthis)....
after that search using advanced options for hidden folders and system files for the word "heap".....a folder will appear in the result (this is a hidden folder).....delete this......if 'access denied' message pops up thin use an application called "unlocker" (download this from:
http://filehippo.com/download_unlocker/ ) to delete it......
after you restart the system this problem should be gone.......
If this does not work you might want to try this:
http://sarathlakshman.info/?p=94 