When I try to restart Jenkins by visiting its /restart URL, it sometimes fails to restart successfully.

When this problem occurs, Process Explorer first shows the existing jenkins.exe and java.exe processes terminate. It then shows a new jenkins.exe as the parent of a new java.exe process and a DW20.exe process (a Microsoft Office error reporting tool). After some time, it shows the jenkins.exe process terminate and the java.exe and DW20.exe processes with no parent. It then shows another jenkins.exe and java.exe start, run briefly, then terminate. This repeats indefinitely. Eventually, DW20.exe terminates. The first java.exe process started runs until manually killed, at which point jenkins.exe and java.exe start and run successfully.

I'll attach the contents of jenkins.err.log from one such occurrence.