Macbook getting terebly slow

hello
i have a macbook 2.2 GhZ, 4GB ram, 144MB video, the 'late 2007' model. everything was fine until some time ago it started doing weird things. i removed a bootcamp-created partition, and from that moment every time it start up i get a black screen saying 'no bootable disk found' or someting like that. but when i press alt on start up, it does show my mac partition, and when i select that, everything goes well, until a week ago. suddenly my macbook started to get extremly slow. safari, itunes, everything is slow. and copying a 700MB file first took a few min most, now it take 50 min:S, so theres something wrong, but i realy dont know what. as far as i know i cant have a virus?
thanks

i forgot to say, that i downloaded a lot lately, so i had only 5 GB free space, while i first had a lot more. so i deleted a lot of files, like 35 GB orso, cause i now have 40 GB, but i believe it stared around that time, not sure if that could be connected?

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early 2011
OS X 10.9 (13A603) Maverics
2 GHz Intel Core i7
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Intel HD Graphics 3000 512 MB
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Hardware Information:
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          MacBook Pro - model: MacBookPro8,2
          1 2 GHz Intel Core i7 CPU: 4 cores
          8 GB RAM
Video Information:
          Intel HD Graphics 3000 - VRAM: 512 MB
          AMD Radeon HD 6490M - VRAM: 256 MB
System Software:
          OS X 10.9 (13A603) - Uptime: 0 days 0:9:56
Disk Information:
          Hitachi HTS545050B9A302 disk0 : (500,11 GB)
                    EFI (disk0s1) <not mounted>: 209,7 MB
                    System (disk0s2) / [Startup]: 145,4 GB (71,97 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
                    Heaven (disk0s4) /Volumes/Heaven: 301,98 GB (41,36 GB free)
                    **** (disk0s5) /Volumes/****: 51,73 GB (978,4 MB free)
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          Apple Inc. BRCM2070 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Computer, Inc. IR Receiver
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Configuration files:
          /etc/hosts - Count: 46
Gatekeeper:
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Kernel Extensions:
          [not loaded] com.silabs.driver.CP210xVCPDriver (3.0.0d1) Support
          [not loaded] com.silabs.driver.CP210xVCPDriver64 (3.0.0d1) Support
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          [loaded] com.adobe.SwitchBoard.plist Support
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