1045's are warn and H60's are not all they are cracked up to be, you would be better served by a good air cooler and some quality thermal paste.
Anyhow...
1. Remove the waterblock off of the CPU, clean both the CPU and waterblock with 90% isopropyl alcohol and a lint free rag.
2. Re assemble using Arctic Silver 5 thermal paste, apply only a pea sized amount to the center of the CPU and properly seat and tighten the water block
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&sqi=2&ved=0CFAQFjAF&url=http%3A%2F%2Fbenchmarkreviews.com%2Findex.php%3Foption%3Dcom_content%26task%3Dview%26id%3D170%26Itemid%3D1&ei=R5uMT8T5NMb62AXprujECQ&usg=AFQjCNGOzuRtVNO-OTDJfkvuxjkDk52m2A&sig2=kukbk_oMgUXAZlvBH1MpBQ
3. Make sure cooler fan on the radiator is exhausting hot air from the case
4. Make sure CPU fan RPM is set to maximum in BIOS
It is somewhat common on these pre manufactured closed loop cooling systems that the pumps are weak or will become weak there in resulting in the coolant liquid not being efficiently circulated. Due to the lack of circulation the cooler will not effectively cool the CPU.