Windows DLL files appearing on HD

[tigerstyl25]

Hi all,

I can't find this issue using the search (although it's being a bit temperamental) - every time I boot my Macbook Pro up, several files appear on the HD.

Deleting before shutdown apparently doesn't stop them. They are:

clauth1.dll
clauth2.dll
lsprst7
ssprs.dll
sysprs7

I'm a little perturbed.. Thanks very much.