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What are your system specs?
Also - it pays to do a clean install versus alot of the online programs you'll see that claim "performance increase" - most of the time these are actually malware that will slow your PC down.
A clean install will give you piece of mind, however it is more time consuming.
Also - a registry clean may be in order.
Like the previous poster said, hardware upgrades are cheap - you can build a VERY fast PC today for under $400. If you're a business user that doesn't require a high end video card (say like a graphic designer/CAD etc) then you can definitely build something considerably faster than your dell for not much $.
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