Open Windows Update. Is there any updates to install? If not, that's probably the issue. I did a fresh install on my computer to try and make it work again and it worked untill I installed the latest Windows 7 updates.
Is this the error your getting?
Problem Event Name: CLR20r3
Problem Signature 01: hznasm.exe
Problem Signature 02: 188.8.131.52
Problem Signature 03: 4e2a93c5
Problem Signature 04: Horizon
Problem Signature 05: 184.108.40.206
Problem Signature 06: 4e2a93c5
Problem Signature 07: 22b1
Problem Signature 08: 170
Problem Signature 09: System.TypeInitialization
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
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If that's the error your getting, just Set to run in compatibility mode: Windows Server 2003 (Service Pack 1)
and set to Run as Administrator. That's how I got it to run.