Windows 7: Windows 7 dont boot after 2 days from instalation

Hello guys,
i need somebody to help me.Yesterday i installed windows7 and i do some restarts for sure that i have install tha correctly...today i try to open my pc and it is not doing boot...what's the prob???is any prbolem with my ram, with hard drives, with mother board?????

Startup Repair

@DeanP is any problem with my hard disk...am i going to change my hard disk???

I am doing start up repair now...it says attempting repairs...repairin disk errors.This might take over an hour to complete...And it is running yet...i have my pc in startup repair for 21 hours...and it is not complete..tell me what to do???

I guess yours is a desktop and not a laptop . Do remove the RAM .... clean the edges and re-insert it (dont forget to disconnect the power line before doing it ). Now run Startup repair .... it will work ok .

If it is possible, afford at least 1GB more RAM of the same FSB of the existing one .

EDIT : You may clean the SATA ports too .... but it is most possibly a RAM issue .

if i re-insert the RAM, the startup will take 1 hour???24 hours it is doing startup repair and there is no result!!!

Startup repair shouldn't take much more time . The only thing is possible there that the memory (RAM) is not working properly . It may gather some moisture or dust etc . After cleaning, is will be done shortly ( for me it takes about 5 - 12 minutes ; sometimes it confirms a complete SFC / scannow and so take some extra time ) .

I guess, option 2 of the tutorial Startup Repair - Run 3 Separate Times will be helpful for you .

with what can i clean the ram and where??

Clean it with some dry cotton cloth, Clean the tooth edges that fits in the slot .