That's odd, ActivePerl v5.8.8 build 820 comes with Time::HiRes 1.86. What makes you think the version of yours is 1.49?

>perl -v
This is perl, v5.8.8 built for MSWin32-x86-multi-thread
(with 50 registered patches, see perl -V for more detail)
...
Binary build 820 [274739] provided by ActiveState http://www.ActiveSta
+te.com
Built Jan 23 2007 15:57:46
...

>perl -e "use Time::HiRes; print Time::HiRes->VERSION
1.86
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Also, I can't find that error in perldiag. Could you show us the minimal code that causes this error and the exact error message?

"Time::HiRes object version 1.49 does not match $Time::HiRes::XS_VERSION 1.86 at C:/Perl/lib/DynaLoader.pm line 253."

Looks like its a problem with IIS5.

I stripped out and reinstalled AP 820 and changed the code from eval { require Time::HiRes; import Time::HiRes qw(time); }; to use Time::HiRes qw(time); seems fine now.

Time::HiRes object version 1.49 does not match $Time::HiRes::XS_VERSION 1.86 at C:/Perl/lib/DynaLoader.pm line 253.

Perl was finding the .pm for v1.49 and the .dll for v1.86. It was a bad install or a bad lib path.

eval { require Time::HiRes; import Time::HiRes qw(time); };

I think you need to overload internals at compile-time, so you'd have to use

BEGIN { eval { require Time::HiRes; import Time::HiRes qw(time) } }
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or

BEGIN { eval 'use Time::HiRes qw(time)' }
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By removing the eval, you removed the ability to fall back onto the lower-precision CORE::time if Time::HiRes isn't installed.