Windows 7 Irregular BSODs

Hello,
I have an Acer Aspire 5560-Sb613 that has been getting a lot of BSODs lately. Unfortunately they don't always occur at the same time and the errors I get vary. When occurring my computer normally freezes up and then 2-3 minutes later get the BSOD. I did a fresh install of the operation system about a month ago and they problem came back with in a couple of days. Any help would be appreciated.
Thanks.