It's from Daemon tools and alchohol 120%. This little bugger is a time bomb. It should work fine with those programs but for some such as myself it will malfunction and crash windows. Expect a BSOD from then on whenever loading normally. On top of that it can cause safe mode to freeze up. Expect a lot of trouble when this software goes bad and make sure to delete it if you don't need it.
caused a BSOD: 0x0000007e error
Couldn't get into safe mode without pressing esc to cancel it loading
Ultimate Boot CD utility Avira NTFS4DOS Personal was able to go into the hard drive and delete the sptd.sys in the windows/system32/drivers directory and thus fix the issue.
Once there, look for sptd.sys and delete it.
Also, click start, run, type msconfig and press enter - look under startup or services for Daemon Tools - uncheck it (sptd IS part of that process and obviously something has gone awry) and this will stop Daemon Tools from starting.
SPTD.sys will not, afaik, delete when you remove Daemon Tools - it HAS to be done manually.
There is another file named sptdXXX.XX (some random number I believe) but I can't remember the extension at the moment.
Another thing you can do is boot into your Windows
sptd.sys may be listed in there.
Then type exit to reboot