Ok so Im making my drumtrack with Steven Slate drums in Reaper. I have it set so it's peaking at -7dbs. All is well. I go to render the drum track, and it says it is peaking at +737 decibels and I get terrible noises coming from my speakers.

What in the balls is going on?
My Setup
Epiphone SG
Ibanez RG2EX1

Line 6 Vetta
Peavey Vypyr 15 for teh lulz

Check my clips out

Click foar epic clipz
+ 737 dbs of gain eh?!

congrats you have put a metalzone onyour drum track!

douchebaggery aside.. my best bet is to check your vsti volume settings and then maybe your audio driver settings.. do you have any other problems recording normally with other instruments like guitar? could be a reaper setting too.. you could try and see if re-installing reaper fixes anything..
Grammar and spelling omitted as an exercise for the reader.