I don't have XP64 but...I'll hazard a guess
. Bear in mind that it's only guesswork.
First, read http://searchwincomputing.techtarget.com/t...1204121,00.html
What I gather from that is...the SysWOW64 folder is the designated repository for 32-bit drivers which are running in XP64.
The tmcomm.sys file belongs to Trend Micro, which is probably your AV program. The fact that it's in the SysWOW folder indicates that you are running 32-bit Trend Micro on your 64-bit system.
For whatever reason, the driver file for Trend Micro AV is causing problems. File corruption is a possibility.
What I would do in your shoes is uninstall TM AV...and then reinstall it and update it, hoping that such solves the problem. Or try another AV program in TM's stead. Or do both, in the order listed, if necessary.
Let us know...