Severe loss of preformance.

Every time i turn on my PC, theres a severe loss of performance when windows starts (And the CPU's fan works at 100%, making this loud noise)....what could cause this? i had the issue before, so i formatted, but the problem is still there.
One of my friends told me that it could be a boot sector virus, i doubt it...hardware issues? perhaps, but i updated all my drivers, and tried everything.

PC = Compaq 5650LA

>>1
Are you using MSIE? If so, you probably got installed all sorts of crap to send spam or grid process something illegally.

have you cleaned the inside of your PC lately? could just be that the fan has to work at 100% because everything is too hot, or the fan is getting clogged with dust.

>>2
Never, aditionally, i use NoAdware, Spybot S&D and Ad-aware SE professional, no spyware here, i'm sure of it.
Scanned with Norton (Norton sucks, but it was from the factory restore) for virus as well, nothing.
>>3
Indeed, cleaned everything after the format, and i remove the dust every two or three months.

BIOS update/CMOS battery reset? Seems like a good place to start. Following that, since it returns after a format.. Maybe your drive is dying? I can't think of anything else that would do something like that, unless your CPU somehow 'broke' halfway- but I've never heard of that happening.

http://www.passmark.com/products/diskcheckup.htm

Boot sector viruses aren't very common at all anymore, and any that do exist do a lot more than just suck up CPU power (actually, boot sector viruses don't run while a modern operating system runs, IIRC).

Boot sector viruses aren't very common at all anymore, and any that do exist do a lot more than just suck up CPU power (actually, boot sector viruses don't run while a modern operating system runs, IIRC).

>>5 thanks for the link, i was suspecting of the HDD as well, but looks like everything is fine:
Drive 0  SMART enabled

IDE REGISTERS:

Features: 0x0         Sector Count: 0x1     Sector Number: 0x1

Cylinder Low: 0x0     Cylinder High: 0x0     Drive Head: 0xA0

Command: 0xEC

DRIVE INFORMATION:

Serial Number: WD-WMAA91021856

FirmWare Rev: 16.06V16

Model Number: WDC WD1200BB-60CJA0

Cylinders: 16383     Heads: 16         Sectors per track: 63

Cur Cyls: 16383     Cur Heads: 16         Cur Sectors/Track: 63

Bytes per track: 57600     Bytes per sector: 914

Gen Config: 17018     Buffer Type: 3         Buffer Size: 4096

Vendor Unique: 10 0 E     More Vendor Unique: 0x8010

ECC Size: 40         Double Word IO: 0     Capabilities: 12032

PIO Timing: 640     DMA Timing: 0     BS: 7

Current Sector Capacity: 16514064     Total Addressable Sectors: 234441648

Mult. Sector Stuff: 272     Single Word DMA: 0     Multi Word DMA: 7



SMART ATTRIBUTES:

ID    Description                         Raw Value    Status     Value     Worst    Threshold

--------------------------------------------------------------------------------------------

1    Raw Read Error Rate                   0       OK       200      200      51

3    Spin Up Time                          5783ms    OK       100      93      21

4    Start/Stop Count                      1309    OK       99      99      40

5    Reallocated Sector Count              0       OK       200      200      140

7    Seek Error Rate                       0       OK       200      200      51

9    Power On Time                         4974    OK       94      94      0

A    Spin Retry Count                      0       OK       100      100      51

B    Calibration Retry Count               0       OK       100      100      51

C    Power Cycle Count                     997     OK       100      100      0

C4    Reallocation Event Count              0       OK       200      200      0

C5    Current Pending Sector Count          0       OK       200      200      0

C6    Offline Scan Incorrect. Sector Count  0       OK       200      200      0

C7    Ultra ATA CRC Error Count             0       OK       200      253      0

C8    Write Error Count                     0       OK       200      200      51

I'm not familiar with the BIOS update/CMOS battery reset? i'll probably google that. but sounds like the next step.

I've had lots of bad hdds, and SMART's never cued me in on any of 'em.  I'd trust SMART to warn you about a failing hard drive almost as much as I'd trust an imprisoned murderer named Bubba not to rape an imprisoned child molester in the arse.