There could be many reasons for that: a faulty installation, bad RAM, a failing hard drive, software corruption, etc.
Is your SSD also your boot drive? PLease give full details about your setup, both hardware and software.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
Thanks for replying,here is a copy of system details.
Component Details Subscore Base score
Processor AMD Phenom(tm) II X4 955 Processor 7.3 6.9
Determined by lowest subscore
Memory (RAM) 8.00 GB 7.5
Graphics NVIDIA GeForce GTS 450 6.9
Gaming graphics 4096 MB Total available graphics memory 6.9
Primary hard disk 72GB Free (238GB Total) 7.2
Windows 7 Home Premium
Manufacturer System manufacturer
Model System Product Name
Total amount of system memory 8.00 GB RAM
System type 64-bit operating system
Number of processor cores 4
Total size of hard disk(s) 3033 GB
Disk partition (C:) 72 GB Free (238 GB Total)
Disk partition (D:) 612 GB Free (932 GB Total)
Media drive (E:) CD/DVD
Disk partition (K:) 1620 GB Free (1863 GB Total)
Display adapter type NVIDIA GeForce GTS 450
Total available graphics memory 4096 MB
Dedicated graphics memory 1024 MB
Dedicated system memory 0 MB
Shared system memory 3072 MB
Display adapter driver version 220.127.116.110
Primary monitor resolution 1920x1080
DirectX version DirectX 9.0 or better
Network Adapter NVIDIA nForce Networking Controller
Hope this is what you mean?