5yo Thinkpad always ALWAYS slow, intermitten hang-ups, frequent BSOD

My Computer My Computer

At a glance

Windows 7 Enterprise x64Intel i5 Dual Core
Computer type
Laptop
Computer Manufacturer/Model Number
Dell
OS
Windows 7 Enterprise x64
CPU
Intel i5 Dual Core
Screen Resolution
1366x768
Keyboard
built in Keyboard
Antivirus
System Centre Endpoint Protection
Browser
Google Chrome, Firefox and Internet Explorer
Hmmm....doesn't sound good. Should I start up in safe mode and do the zip? and I'm sorry to bother you but which Memtest option do I need?
THANKS!
 

My Computer My Computer

At a glance

windows 7 professional 64 bitIntel Core i7 2640M cpu 2.80Ghz8 gig
Computer type
Laptop
Computer Manufacturer/Model Number
Lenovo
OS
windows 7 professional 64 bit
CPU
Intel Core i7 2640M cpu 2.80Ghz
Memory
8 gig
Hard Drives
IDE\DiskHITACHI_HTS725050A9A364_________________PC4ZC70F
Antivirus
avast
Browser
firefox
find the pre-built version.
 

My Computer My Computer

At a glance

Windows 7 Enterprise x64Intel i5 Dual Core
Computer type
Laptop
Computer Manufacturer/Model Number
Dell
OS
Windows 7 Enterprise x64
CPU
Intel i5 Dual Core
Screen Resolution
1366x768
Keyboard
built in Keyboard
Antivirus
System Centre Endpoint Protection
Browser
Google Chrome, Firefox and Internet Explorer
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