Crashes and slowdowns

Hello, I've been having a problem with my computer that was originally with a program, but now I guess I could call it just the computer. I had a program called messenger plus for skype installed, and it asked to update, so I did, ever since it updated, my computer has been slowing down and occasionally crashing. I tried uninstalling the program and not reinstalling it, uninstalling and reinstalling skype, and system restore. When I try to system restore it says a file in temp can't be restored, so I cleared the temp files, but I assume that also cleared my restore points because they are no longer there. When the computer recovers from the unexpected shutdown, I get this:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: c5
BCP1: 00000004
BCP2: 00000002
BCP3: 00000001
BCP4: 82D734C1
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\051313-20358-01.dmp
C:\Users\Alida\AppData\Local\Temp\WER-30248-0.sysdata.xml

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I have no idea what to do, so can anyone help me with this?