If your computer’s plagued with annoying error messages, or just generally under the weather, then registry repair software will quickly get it firing on all cylinders again.
They’re all free to try, so give ‘em a go…
Most thorough registry repair software — Reimage PC Repair
Pros 
Fixes frustrating Windows problems. Makes your computer run like new again. Completely replaces the Windows registry. Repairs the damage wreaked by viruses. Saves you reinstalling Windows. Quicker & cheaper than a PC repair technician.
Cons You need an Internet connection. Can take up to an hour.
Verdict The best PC repair software you can get… bar none.
Full review: Reimage PC Repair review
Requirements: Windows® 8 (64-bit & 32-bit), 7 (32-bit & 64-bit), Vista (32-bit & 64-bit) or XP (32-bit).
Download Reimage PC Repair now
Visit the Reimage PC Repair website now
Most useful features — PC Health Advisor
Pros 
It fixes thousands of PC problems. Optimizes your computer’s performance. Updates your computer’s drivers. Protects your computer privacy. Includes seven essential system maintenance tools.
Cons None.
Verdict Probably the only computer maintenance software you’ll ever need.
Full review: PC Health Advisor review
Requirements: Windows® 8 (64-bit & 32-bit), 7 (64-bit & 32-bit), Vista (64-bit & 32-bit) or XP (32-bit).
Download PC Health Advisor now
Visit the PC Health Advisor website now
Best at optimizing your computer — RegCure PC Optimizer
Pros 
Fixes thousands of Windows problems. Cleans and optimizes the Windows registry. Helps you speed-up Windows Startup. Scheduler lets you fix problems automatically. Used by more than 60 million people.
Cons Superseded by PC Health Advisor.
Verdict PC Health Advisor gives you more bang for your buck.
Full review: RegCure PC Optimizer review
Requirements: Windows® 8 (64-bit & 32-bit), 7 (64-bit & 32-bit), Vista, XP, ME, 2000 or 98SE (all 32-bit).
Visit the RegCure Pro website now
Also worth checking out — Registry Mechanic 10
Pros 
Fixes annoying Windows errors. Optimizes and speeds-up your computer. Protects your computer privacy. Securely erases your sensitive data. Alerts you when you need to run a scan. Keeps your computer optimized.
Cons Some tools just duplicate Windows tools.
Verdict Great if you wanna keep your computer running like new and stop people snooping on you.
Full review: Registry Mechanic 10 review
Requirements: Windows® 8 (32-bit & 64-bit), 7 (32-bit & 64-bit), Vista (32-bit & 64-bit) or XP (32-bit).