A test locks the scratch directory so all next regression tests produce the Error status

Sometimes during execution full automated regression test suite the failed and frozen test locks scratch dir or files within it. Then all next tests produce a Error status - "
CTE_REGTEST/Generic/4294758/StreamPPApplet.java Error. Problem deleting file: D:\RegressionResult-142u11b3-pass0\work\scratch\test.out
CTE_REGTEST/Generic/4298156/Bug4298156.java Error. Problem deleting file: D:\RegressionResult-142u11b3-pass0\work\scratch\test.out
CTE_REGTEST/Generic/4298667/Fips.java
"
I saw it happened on windows systems (Windows 2000 32bit, Windows XP 64bit)
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How to reproduce:
run JTreg with appropriate JDK (please use 1.4.2_11b4-64bit-amd for Windows XP -64bit)
The workspace is placed on /net/latte.ireland/deployment1/regtests/142/test
the JTreg is placed on /net/latte.ireland/deployment1/sqe-tools2.1.6fcs
to run please get and locally configure /net/latte.ireland/deployment1/regtests/wrunRegression.ksh. keep -timeout:20 in setting
then just press start on harness.
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It happened even if to run suites with Administrator's privileges.