To avoid some PHP startup errors
From the directory of the active version of PHP: wamp\bin\php\php5.x.y\ copy these dll files
icudt**.dll
icuin**.dll
icuio**.dll
icule**.dll
iculx**.dll
icutest**.dll
icutu**.dll
icuuc**.dll
libeay32.dll
libmhash.dll
libmysql.dll
libsasl.dll
(According PHP version, ** may be 48, 49, 50, 51 or 52)
Into the directory of the active version of Apache: wamp\bin\apache\Apache2.x.y\bin\
Do a Refresh or a Wampserver restart.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons